The essential nature of certain minor elements for plant nutrition

Agulhon, H. Recherches sur la présence et la rôle du bore chez les végétaux. Thèse. Paris, 1910. Allison, R. V. The rôle of special elements in plant development upon the peat and muck soils of the Everglades. Fla. Agr. Exp. Sta. Rep., p. 129. 1930. Allison, R. V., Bryan, O. C. and Hunter, J. H. The stimulation of plant response on the raw peat soils of the Florida Everglades through the use of copper sulphate and other chemicals. Fla. Agr. Exp. Sta. Bull. 190, pp. 35–80. 1927. Alten, F. undGottwick, R. Ein Beitrag zur Frage der Vertretbarkeit des Kaliums durch Rubidium und Caesium für die Pflanzen-ernährung. Ernähr. Pflanze.29: 393–399. 1933. Anderssen, F. G. Chlorosis of deciduous fruit trees due to a copper deficiency. Jour. Pomol.10: 130–146. 1932. Bambacioni-Mezzetti, V. Aziona dei sali di Berillio, Zirconio e Pal-ladio sulla sensibilità geotropica della radici. R. C. Accad. Lincei.20: 125–128. 1934. —. Action of uranium chloride and of gamma-rays on the geotropical sensibility of roots. Atti. Soc. Ital. Prog. Sci.22: 56–57. 1934. Belousov, M. A. The effect of boron on the development of the sugar beet in water cultures (trans. title). Trans. Cent. Sci. Res. Inst. Sugar Indus.8: 50–60 (German abs.). 1932. Abs. in E. S. R.71: 757. 1934. Bertrand, G. Various early references given in Inorganic Plant Poisons and Stimulants, by W. E. Brenchley (Cambridge Univ. Press). II ed. 1927. Bertrand, G. et Mokragnatz, M. Répartition du nickel et du cobalt dans les plantes. Compt. Rend.190: 21–25. 1930; Bull. Soc. Chim. France. IV.47: 326–331. Bertrand, G. et Rosenblatt, M. Sur la teneur inégale en man-ganese des feuilles vertes et des feuilles étiolées. Ann. Inst. Pasteur.49: 492–494. 1932. Bishop, E. R. andLawrenz, M. Cobalt in plant ash. Science75: 264–265. 1932. Bobko, E. W. et Belousov, M. A. Importance du bore pour la betterave à sucre. Ann. Agron.3: 493–504. 1933. Bolin, D. W. The manganese content of grasses and alfalfa from grazed plots. Jour. Agr. Res.48: 657–663. 1934. Bortner, C. E. Toxicity of manganese to Turkish tobacco in acid Kentucky soils. Soil Sci.39: 15–24. 1935. Brandenburg, E. Eenige gevallen van physiologische ziekten der bieten. I. Meded. Inst. Suikerbiet. Bergen-o-Z.1: 89–104. 1931. —. De beteekenis van borium en mangaan voor den groei der planten, in het bijzonder voor den groei der bieten. Land-bouwk. Tijd.44: 790–792. 1932. —. Hartrot-Oorzaak en bestrijding. Meded. Inst. Suiker-biet. Bergen-o-Z.2: 43–75. 1932. —. Onderzoekingen over ontginningsziekte. Tijd. Pl. Ziekt.39: 189–192. 1933. —. Über die Bedeutung des Kupfers für die Entwicklung einiger Pflanzen im Vergleich zu Bor und Mangan und über Kup-fermangelerscheinungen. Angew. Bot.16: 505–509. 1934. —. Potproeven en proefvelden ter bestudeering van het hartrot. Meded. Inst. Suikerbiet Bergen-o-Z.5: 81–91. 1935. Brenchley, W. E. The effect of rubidium sulphate and palladium chloride on the growth of plants. Ann. Appl. Biol.21: 398–417. 1934. Camp, A. F. Zinc sulphate as a soil amendment in citrus groves. Proc. Fla. State Hort. Soc. 33–38. 1934; Citrus Ind.15: No. 10 : 16–18. 1934. Chandler, W. H., Hoagland, D. R. andHibberd, P. L. Little-leaf or rosette of fruit trees. II. Effect of zinc and other treat-ments. Amer. Soc. Hort. Sci. Proc.29: 255–263. 1932;30: 70–86. 1933;32: 11–19. 1934. Chapman, C. W. The relation of iron and manganese to chlorosis in plants. New Phyt.30: 266–283. 1931. Clark, N. A. Manganese and the growth ofLemna. Plant Physiol.8: 157–161. 1933. Clark, N. A. andFly, C. L. The rôle of manganese in the nutrition ofLemna. Plant Physiol.5: 241–247. 1930. Coleman, J. M. andRuprecht, R. W. Effect of fertilisers and soil types on the mineral composition of vegetables. Tour. Nutrition9: 51–62. 1935. Conner, S. D. Factors affecting manganese availability in soils. Amer. Soc. Agron.24: 726–733. 1932. -. Treatment of muck and dark sandy soils. Ind. Agr. Ext. Service. Leaflet 179. 1933. Cooper, H. P. et al. Effect of calcium arsenate on the productivity of certain soil types. S. C. Agr. Exp. Sta. Rep. 28–36. 1931. Cotton, M. Toxic effects of iodine and nickel on buckwheat grown in solution cultures. Bull. Torrey Bot Club57: 127–140. 1930. Davies, D. W. andJones, E. T. Grey speck disease of oats. Welsh Jour. Agr.7: 349–358., 1931. Davies, L. E. Manganese as an essential element in the growth of sugar cane. Hawaii Plant. Rec.35: 393–400. 1931. Demaree, J. B., Fowler, E. D. and Crane, H. L. Control of Pecan rosette with zinc sulphate. Proc. 28th Ann. Con., S. E. Pecan Growers Ass. 29–37. 1934. Dufrenoy, J. Effect of zinc on the growth of grape-vine. C. R. Soc. Biol.118: 156–158. 1935. Dufrenoy, J. andReed, H. S. Pathological effects of the deficiency or excess of certain ions on the leaves of citrus plants. Ann. Agron. (N. S.)4: 637–653. 1934. Eaton, F. M. The effect of boron on powdery mildew and spot Wotch of barley. Phytopath.20: 967–972. 1930. —. Boron requirements of cotton. Soil Sci.34: 301–305. 1932. Eddins, A. H. Effect of inoculated sulphur lime and mercury com-pounds on the yield of potatoes. Amer. Potato Jour.11: 295–302. 1934. Eisenmenger, W. S. Toxicity of aluminium for seedlings and the action of certain ions in the elimination of the toxic effects. Mass. Agr. Exp. Sta. Ann. Rep.13. 1933. Finch, A. H. Pecan rosette, a physiological disease apparently sus-ceptible to treatment with zinc. Amer. Soc. Hort. Sci. Proc.29: 264–266. 1932. Foex, E. et Burgevin, H. Observations sur la maladie du coeur de la betterave. C. R. Acad. Agr.20: 978–983. 1934;21: 979–985. 1935. Fron, G. Observations sur l’influence de la pluviosité sur la développe-ment de la maladie du coeur de la betterave. C. R. Acad. Agr.20: 883–888. 1934. Gerretsen, F. C. The effect of manganese efficiency on oats, in rela-tion to soil bacteria. Trans. 3rd. Int. Cong. Soil Sci.1: 189–191. 1935. Gilbert, B. E. Normal crops and the supply of available soil manga-nese. R. I. Agr. Exp. Sta. Bull.246: 5–15. 1934. Gilbert, B. E. andPember, F. R. The sensitivity of red clover (Tri- folium pratense) to small amounts of boron and manganese. Plant Physiol.6: 727–730. 1931. Haan, K. de. Beschouwingen over de Practische Suikerbietenteelt. IV. Mangan-gebrek bij Suikerbieten. Meded. Inst. Suikerbiet.4: 123–127. 1934. —. Verdere velproeven voor het onderzoek naar de werking van borax op suikeren volderbieten. Meded. Inst. Suikerbiet. Bergen-o-Z.5: 92–102. 1935. Haas, A. R. C. Boron as an essential element for healthy growth of citrus. Bot. Gaz.89: 410–413. 1930. —. Injurious effects of manganese and iron deficiencies on the growth of citrus. Hilgardia. Cal. Agr. Exp. Sta.7: 181–206. 1932. —. Walnut yellows in relation to ash composition, manga-nese, iron and other ash constituents. Bot. Gaz.94: 495–512. 1933. Haas, A. R. C. andKlotz, L. J. Some anatomical and physiological changes in citrus produced by boron deficiency. Hilgardia5: 175–196. 1931. ——. Further evidence on the necessity of boron for health in citrus. Bot. Gaz.92: 94–100. 1931. Hance, F. E. Less common elements in solids and fertilisers. Hawaii Sugar Planter’s Ass. Proc. 53rd. Ann. Meeting. 46–63. 1933. Heller, K., Peh, K. undGürtler, F. Über die Aufnahme von Ru-bidium durch die Kartoffelpflanze. Zeits. Pflanz. Düng. A.35: 215–222. 1934. Hoagland, D. R. andSnyder, W. C. Nutrition of strawberry plant under controlled conditions: (a) effects of deficiencies of boron and of injury from sodium salts. Proc. Amer. Soc. Hort. Sci.30: 288–294. 1933. Hoffman, I. C. The use of manganese in vegetable greenhouses. Ohio Agr. Exp. Sta. Bi-Mo. Bull.149: 58–62. 1931. -. Mineral deficiency symptoms in tomato and cucumber plants. Ohio Vegetable Grower’s Ass. Proc. 18th. Ann. Meeting. 58–59. 1933. Hopkins, E. F. The necessity and function of manganese in the growth ofChlorella sp. Science72: 609–610. 1930. -. Manganese an essential element for green plants. Mem. 151. N. Y. (Cornell) Agr. Exp. Sta. 1934. Horn, E. E., Ward, J. C., Munch, J. C. andGarlough, F. E. The effect of thallium on plant growth. Science80: 167–168. 1934. Hughes, W. and Murphy, P. A. Crown rot of sugar beet a boron deficiency. Nature, March 9th, 1935. p. 395. 1935. Hughes, H. J. andRiches, J. H. Field experiments with manganese on wheat and oats, 1931. Tour. Dep. Agr. West Australia9: 311–312. 1932. Hurd-Karrer, A. M. Inhibition of selenium injury to wheat plants by sulphur. Science78: 560. 1933. —. Factors affecting the absorption of selenium from soils by plants. Jour. Agr. Res.50: 413–427. 1935. Isaac, W. E. Researches on the chlorosis of deciduous fruit trees. II. Experiments on chlorosis of peach trees. Trans. Roy. Soc. S. Africa.22: 187–204. 1934. Iyer, C. R. H., Rajagopalan, R. andSubrahmanyan, V. Rôle of organic matter in plant nutrition. II. Oxidising agents as fer-tilisers. Proc. Ind. Acad. Sci.1B: 106–122. 1934. Jacks, G. V. and Scherbatoff, H. Soil deficiencies and plant dis-eases. Technical Communication No. 31 of the Imperial Bureau of Soil Science, Harpenden, England. 48. 1935. Javillier, M. Recherches sur la présence et le rôle du zinc chez les plantes. Thèse. Paris. 1908. Johnston, E. S. andFisher, P. L. The essential nature of boron to growth and fruiting of the tomato. Plant Physiol.5: 387–392. 1930. Kapp, D. C. Preliminary report on the effect of certain chemicals on rice production and their effect on the rice soil. Ark. Agr. Exp. Sta. Bull.277: 1932. Katalymov, M. V. The fertilization of improved soils. 3rd. Conf. Int. d’Engrais Chim.25: 15. 1934; See also Miner. Udoh. No.1: 67–71. 1935.; Khim. Sotsial. Zemled. No.2: 42–48. (Russian). 1935. Kaufmann, O. Use of boron against heart- and dry-rot of beet. Deut. Zuckerind.59: 305–306. 1934. Abs. Int. Sugar Jour.36: 278. Klein, -. Wirkung von Jodkali auf Gemüsepflanzen. Rhein. Mschr. Obst.26: 274. 1933. Abt. Zeits. Pflanz. Düng. A.37: 238. Knight, H. G. The selenium problem. Jour. Ass. Off. Agr. Chem.18: 103–108. 1935. Knott, J. E. Some factors affecting the colour and thickness of onion scales. Proc. Amer. Soc. Hort. Sci.28: 318–322. 1931. -. The effect of certain mineral elements on the colour and thickness of onion scales. Bull. Cornell Agr. Exp. Sta.552: 1933. Kuijper, J. Boorzuur tegen de topziekte van de tabak. Vlugschr. No. 50. Proefstation te Medan, Sumatra. 1930. Leeper, G. W. Relationship of soils to manganese deficiency of plants. Nature134: 972–973. 1934. Lipman, C. B. andMackinney, G. Proof of the essential nature of copper for higher green plants. Plant Physiol.6: 593–599. 1931. Lundegårdh, H. Markbeskaffenhet och gödlingsbehov. (Soil con-ditions and nutrient requirements. (Eng. summary). Kgl. Landtbruks. Akad. Handl. Tid.73: 225–289. 1934. McCool, M. M. Effect of thallium sulphate on the growth of sev-eral plants and on nitrification in soils. Boyce Thompson Inst. Contr.5: 289–296. 1933. McHargue, J. S. andCalfee, R. K. Effect of manganese, copper and zinc on growth and metabolism ofAspergillus flavus andRhizopus nigricans. Bot. Gaz.91: 183–193. 1931. ——. Effect of manganese, copper and zinc on the growth of yeast. Plant Physiol.6: 559–566. 1931. ——. Effect of boron on the growth of lettuce. Plant Physiol.7: 161–164. 1932. ——. Further evidence that boron is essential for the growth of lettuce. Plant Physiol.8: 305–313. 1933. McHargue, J. S. andShedd, O. M. The effect of manganese, copper, zinc, boron and arsenic on the growth of oats. Jour. Amer. Soc. Agron.22: 739–746. 1930. MacLeod, D. J. Brown heart in turnips Unpub. Rep. from Dominion Field Lab. of Plant Path., Fredericton, N. B., Canada. 1934. MacLeod, D. J. andHowatt, J. L. Soil treatment in the control of certain soil-borne diseases of potatoes. Amer. Potato Jour.11: 60–61. 1934. McMurtrey, J. E. The effect of boron deficiency on the growth of tobacco plants in aerated and unaerated solutions. Jour. Agr. Res.38: 371–380. 1929. —. Effect of thallium on growth of tobacco plants. Science76: 86. 1932. -. Distinctive effects of the deficiency of certain essential elements on the growth of tobacco plants in solution cultures. U. S. Dept. Agr. Tech. Bull. 340. 1933. McMurtrey, J. E.. Boron deficiency in tobacco under field conditions. Jour. Amer. Soc. Agron.27: 271–273. 1935. McWhorter, O. T. Zinc sulphate treatments for cherries. Better Fruit29: 4. 1934. Malherbe, I. de V. Little-leaf or roset of fruit trees. Farming S. Africa9: 312–313, 315. 1934. Mann, H. B. Availability of manganese and of iron as affected by applications of calcium and magnesium carbonates to the soil. Soil Sci.30: 117–141. 1930. Martin, J. P. Symptoms of malnutrition manifested by the sugar plant when grown in culture solutions from which certain essen-tial elements are omitted. Hawaii Plant Rec.38: 3–31. 1934. —. Boron deficiency symptoms in sugar cane. Hawaii Plant Rec.38: 95–108. 1934. Martini, A. Der phytomikro-chemische Nachweis des Nickels und sein Vorkommen im Pflanzenreich. Mikrochemie8: 41–45. 1930. Maschaupt, J. G. Das Rätsel der Dörrfleckenkrankheit. Zeits. Pflanz. Düng.13B: 313–320. 1934. Mes, M. G. Fisiologiese Siektesimptome van tabak. Proefschrift. Baarn., pp. 141. 1930. —. Physiological disease symptoms of tobacco. Phytopath. Zeits.2. Heft6: 593–614. 1930. Meurs, A. Bestrijden en voorkomen van topziekte. Veugschr. No. 59, Proefstation te Medan, Sumatra. 1932. Meyer, A. H. Some neglected factors in plant growth. Jour. Amer. Soc. Agron.28: 605–624., 1931. Meyer-Hermann, K.Neue Wege zur Bekämpfung der Herz- und Trockenfaule der Rüben. Deut. Landw. Pr.60: 194, 205. 1933. Miller, L. P. Effect of manganese deficiency on the growth and sugar content of plants. Amer. Jour. Bot.20: 621–631. 1933. Miller, L. andMitchell, H. S. Correlation of copper and manga-nese content of plants and mineral additions to the soil. Jour. Amer. Diet. Ass.7: 252–257. 1931. Mitchell, J. H. A study of the influence of different factors on the iodine content of plants. S. C. Agr. Exp. Sta. Rep. 47–48. 1930. Mokragnatz, C. Action du nickel et du cobalt sur le développement de l’Aspergillusniger. Bull. Soc. Chim. Biol.13: 61–71. 1931. Morris, H. Physiological effects of boron on wheat. Bull. Torrey Bot. Club58: 1–30. 1931. Morse, H. H. The toxic influence of fluorine in phosphatic fertilisers on the germination of corn. Soil Sci.39: 177–193. 1935. Mowry, H. andCamp, A. F. Zinc sulphate as corrective for bronz-ing of tung trees. Fla. Agr. Exp. Sta. Bull.273: 34. 1934. Nowotnówna, A. Untersuchungen über die Wirkung des Bors auf das Wachstum der Sojabohnen und der Zuckerrüben (with Ger-man summary). Mem. Inst. Nat. Pol. Econ. Rur. Pulawy.15: Mem. 226: 19–36. 1934. O’Brien, D. G. andDennis, D. W. G. Raan or boron deficiency in swedes. Scot. Jour. Agr.18: 326–334. 1935. Odland, T. E. andCrandall, F. K. The effect of the lack of avail-able manganese in the soil on crop yields. Jour. Amer. Soc. Agron.24: 622–626. 1932. Olsen, C. The absorption of manganese by plants. C. R. Lab. Carls-berg.20: 34. 1934; Biochem. Zeits.269: 329–348. (German.) Orth, O. S., Wickwire, G. C. And Burge, W. E. Copper in relation to chlorophyll and haemoglobin formation. Science79: 33–34. 1934. Oserkowsky, J. andThomas, H. E. Exanthema in pears and its relation to copper deficiency. Science78: 315–316. 1933. Owen, O. The effect of copper sulphate on tomato plants. Ann. Appl. Biol.16: 430–437. 1929. Paden, W. R. and Albert, W. B. Effect of the addition of arsenical compounds to soil. S. C. Agr. Exp. Sta. Rep. 31–33. 1930. Parker, E. R. Experiments on the treatment of mottle-leaf of citrus trees. Proc. Amer. Soc. Hort. Sci.31: 98–107. 1935. Pettinger, N. A., Henderson, R. G. andWingard, S. A. Some nutritional disorders in corn grown in sand cultures. Phytopath.22: 33–51. 1932. Piper, C. S. The availability of manganese in the soil. Jour. Agr. Sci.21: 762–779. 1931. Pirschle, K. Comparative investigations on the physiological effect of the elements as shown by growth experiments withAsper-gillus niger. Planta (Abt. E. Z. Wiss. Biol.)23: 177–224. 1934. Raulin, J. Études chimiques sur la végétation. Ann. Sci. Nat.11: 139–140. 1869. Remington, R. E. andShiver, H. E. Iron, copper and manganese content of some common vegetable foods. Jour. Ass. Off. Agr. Chem.13: 129–132. 1930. Robbins, W. R. Celery chlorosis. N. J. Agr.15: 5–6. 1933. Rolet, A. Le sulfate de cuivre qui tombe sur le sol des vignobles. Vie Agr. Rur.23: 345–346. 1934. Ruprecht, R. W. Effect of various fertiliser treatments and of soil amendments on tomatoes. Fla. Agr. Exp. Sta. Rep., p. 61. 1930. Russell, R. and Manns, T. F. The value of copper sulphate as a plant nutrient. Trans. Peninsula Hort. Soc. 51–57. 1933. Saegar, A. Manganese and the growth of Lemnaceae. Amer. Jour. Bot.20: 234–245. 1933. Samuel, G. andPiper, C. S. Manganese as an essential element for plant growth. Ann. Appl. Biol.16: 493–524. 1929. Scharrer, K. undSghropp, W. Die Wirkung des Fluor-Ions auf Keimung und Jugendwachstum einiger Kulturpflanzen. Landw. Vers. Sta.114: 203–214. 1932. —— und Wasserkulturversuche über die Wirkung des Bors auf Keimung und Jugendwachstum einiger Kulturpflanzen. Zeits. Pflanz. Düng. A28: 313–329. 1933. —— und Wasserkulturversuche über die Wirkung des Kupfer-Ions. Zeits. Pflanz. Düng. A32: 184–200. 1933. —. Wasser- und Sandkulturversuche mit Mangan. Pflanz. Düng. A36: 1–15. 1934. —. Beiträge zur Frage der Wirkung des Bors auf das Pflan-zenwachstum. Landw. Jahrb.79: 977–1000. 1934. —. Wasserkulturversuche über die Wirkung des Bors in Düngemitteln. Phytopath. Zeits.7: 245–254. 1934. —. Wasser- und Sandkulturversuche über die Wirkung Molybdat- und Wolframat-Ions. Zeits. Pflanz. Düng. A34: 312–322. 1934. —. Sand- und Wasserkulturversuche über die Wirkung des Zink und Kadmium-Ions. Zeits. Pflanz. Düng. A34: 14–29. 1934. Schmid, R. Note on a boron deficiency disease of sugar beet. Deut. Landw. Gesell.49: 366–367. 1934. Scholz, W. Über die chlorose der blauen Lupine und Serradella in ihrer Beziehung zum Eisen und Mangan. Zeits. Pflanz. Düng.A35: 88–101. 1934. Scofield, C. S. and Wilcox, L. V. Boron in irrigation waters. U. S. Dept. Agr. Tech. Bull. 264. 1931. Scott, R. C. Field experiments with manganese deficiency of barley. Jour. Dept. Agr. S. Australia35: 771–780. 1932. Shive, J. W. Blueberry nutrition. N. J. Agr.15: No. 4. 1933. Schreven, D. A. van. Uitwendige en inwendige Symptomen van bori-umgebrek bij Tabak (with English summary). Tijdschr. Planten-ziekt.40: 98–128. 1934. —. Uitwendige en inwendige Symptomen van boriumgebrek bij tomaat (with English summary). Tijdschr. Plantenziekt.40: 1–26. 1935. Shkolnik, M. The effect of boron upon the development of flax in water and soil cultures. Compt. Rend. Acad. Sci. U. S. S. R. 107–109. 1934; 167–173. 1935. Sjollema, B. Kupfermangel als Ursache von Krankheiten bei Pflanzen und Tieren. Biochem. Zeits.267: 151–156. 1933. Skinner, J. J., Bahrt, G. M. and Hughes, A. E. Influence of fer-tilisers and soil amendments on citrus trees, fruit production and quality of fruit. Proc. Fla. Hort. Soc. 9–17. 1934. Skinner, J. J. and Ruprecht, R. W. Fertiliser experiments with truck crops. Fla. Agr. Exp. Sta. Bull. 218. 1930. Smirnoff, A. J. Der Einfluss des Bors auf das Wachstum des Tabaks unter Berücksichtigung des Reaktionszustandes der Nährstoff-lösung und der Stickstofform. Staat. Inst. Tabakkunde, Ausgabe 70, Krasnodar. 1930. Solunska, N. I. Influence of boron on heart disease of the sugar beet. Scientific Notes on the Sugar Industry40. 48 (Organ of the V. N. I. S., i.e., Soviet Research Inst. for the Sugar Indus-try). (Trans.) 1934. Sommer, A. L. Copper as an essential for plant growth. Plant Physiol.6: 339–345. 1931. Steinberg, R. A. The nutritional requirements of the fungus,Asper-gillus niger. Bull. Torrey Bot. Club62: 81–90. 1935. Talibly, C. A. The importance of microelements and the Ca/Mg ratio for plant growth when liming acid soils. Zeits. Pflanz. Düng. A39: 257–264. 1935. Terlikowski, F. andNowicki, B. The boron content of some soils, plants and potassium fertilisers. Rocz. Nauk. Roln. (Polish Agr. Forest. Ann.)28: 135–144. 1932. Turner, P. E. Manganese in relation to juice purity of sugar cane. Proc. Sugar Cane Invest. Com. Trin.4: 247–248. 1933. Waite, M. B. Zinc proves useful in the control of some plant dis-eases. U. S. Dept. Agr. Yearbook. 380–382. 1934. Warington, K. The effect of boric acid and borax on the broad bean and certain other plants. Ann. Bot.37: 629–672. 1923. —. The influence of length of day on the response of plants to boron. Ann. Bot.47: 429–457. 1933. —. Studies in the absorption of calcium from nutrient solu-tions with special reference to the presence or absence of boron. Ann. Bot.48: 743–776. 1934. Wild, A. S. Field experiments with manganese as a control of grey speck disease in Western Australia. Jour. Dept. Agr. West Australia2: 223–225. 1934. Williams, C. B. Factors influencing the productivity of muck soils. N. C. Exp. Sta. Rep., 46–47. 1930. Willis, L. G. Bibliography of references to the literature on the minor elements and their relation to the science of plant nutri-tion. Chilean Nitrate Educ. Bur., Inc., pp. 455. 1935. Willis, L. G. and Mann, H. B. Manganese as a fertilizer. Amer. Fert., Jan. 4, 1930. Willis, L. G. andPiland, J. R. The influence of copper sulphate. on iron absorption by corn plants. Soil Sci.37: 79–83. 1934. Wilson, L. B. Effects of chlorine, bromine and fluorine on the tobacco plant. Jour. Agr. Res.46: 889–899. 1933. Whitehead, T. A note on “Brown Heart,” a new disease of swedes, and its control. Welsh Jour. Agr.11: 235–236. 1935. Wynd, F. Lyle. The effects of increasing the iodine content of the tomato plant on respiration and enzymic activity. Ann. Mo. Bot. Gard.21: 367–431. 1934. Zemiuk, A. V. Copper containing wastes and low grade copper ores as fertilisers for swamp soils. Khim. Sotsial Zemled. No. 5, 45–53 (Russian). 1935. Zlataroff, A. Nouvelles contributions expérimentales pour l’explica-tion de l’influence des stimulants chimiques sur la croissance des semences des plantes. Bull. Soc. Chim. Biol.16: 1720–1729. 1934. -. Soil and fertiliser investigations of the Michigan Station. Mich. Sta. Bienn. Rep., 53–55. 1931–1932.