Effects of Field Applications of Nitrate on Weed Seed Germination and Dormancy

Weed Science - Tập 26 Số 6 - Trang 594-596 - 1978
R. S. Fawcett1, F. W. Slife1
1Dep. Bot. and Plant Pathol., Iowa State Univ., Ames, IA 50011

Tóm tắt

Application of 112 to 336 kg/ha N as ammonium nitrate [NH4(NO−3)] failed to affect population numbers of common lambsquarters(Chenopodium albumL.), giant foxtail(Setaria faberiHerrm.), velvetleaf(Abutilon theophrastiMedic.), jimsonweed(Datura stramoniumL.), or redroot pigweed(Amaranthus retroflexusL.). Common lambsquarters seeds harvested from NO−3-treated plots were less dormant than control seeds. Seed germination in the laboratory increased from 3.0% for control seeds to 34.0% for seeds harvested from plots treated with 280 kg/ha N as NH4(NO−3). Nitrate concentration in common lambsquarters seeds increased as nitrogen fertilization increased. Seeds from nonfertilized plots contained 18.7 μg/g NO−3, while seeds from plots fertilized with 280 kg/ha N contained 126.3 μg/g. Adding exogenous NO−3to the germination medium brought the germination of most seed lots to a similar level, except for control seeds which germinated at a lower rate. In contrast to common lambsquarters, nitrogen fertilization did not greatly affect dormancy or NO−3accumulation in velvetleaf seeds. Exogenous NO−3failed to stimulate velvetleaf germination because dormant velvetleaf seeds did not imbibe.

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Tài liệu tham khảo

McNamara, 1971, Use of a dissimilatory nitrate reductase from Eschericha coli and formate as a reductive system for nitrate assays, J. Agric. Food Chem., 13, 72

Mayer, 1963, The Germination of Seeds, 236

10.2134/agronj1943.00021962003500080004x

10.1111/j.1399-3054.1964.tb09014.x

10.2307/2435354

Roberts, 1969, Dormancy and Survival. 1968 Symposia of the Society for Experimental Biology, 161

10.1146/annurev.pp.13.060162.002253

10.1002/j.2050-0416.1956.tb02868.x

10.2307/4040699

10.1111/j.1399-3054.1963.tb08351.x

McNamara, 1971, Nitrate content of seeds of certain crop plants, vegetables, and weeds, J. Agric. Food Chem., 19, 540, 10.1021/jf60175a002

Taylorson, 1969, Photocontrol of rough cinquefoil seed germination and its enhancement by temperature manipulation and KNO3, Weed Sci., 17, 144, 10.1017/S0043174500031192

Taylorson, 1970, Changes in dormancy and viability of weed seeds in soils, Weed Sci., 18, 265, 10.1017/S0043174500079716

Toole, 1941, Progress of germination of seed of Digitaria as influenced by germination temperature and other factors, J. Agric. Res. (Washington D.C.), 63, 65

10.2307/4040187

10.1146/annurev.pp.07.060156.001503

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Thông tin xuất bản

Weed Science

Tập 26 Số 6

594-596

Thông tin tác giả