Growth chamber study of phosphorus applied as drilled granules or as seed coatings to wheat sown in soils differing in P-sorption capacity
Tóm tắt
The effect of seed coatings or drilled granules containing phosphorus (P) on the early growth of wheat was evaluated in a pot trial in two soils differing in P-sorption capacity. P as monocalcium phosphate (MCP) was applied in seed coatings (C) at rates of 0 (inert coating of diatomaceous earth), 5 and 10 kg P ha−1 whereas drilled rates (D) of P were applied at 0, 5, 10, 20 and 40 kg P ha−1 to wheat sown at the equivalent of 60 kg ha−1. The soils used were an aquic haplustalf with low (LS) and a gibbsiorthox with high (HS) P-sorption capacities respectively. Both soils were deficient in P, having 7.3 and 13.1 ppm available P in the LS and HS soils respectively. Emergence was recorded and plant height was measured at regular intervals. Shoot and root dry weights and P contents were determined in the final harvest at 27 days after sowing. Emergence was significantly delayed only by C10. Cumulative plant height per pot of C5 was significantly greater than that of C0, C10, D0, D5 or D10 from day 17 onwards. The only drilled treatments to produce a significant increase in plant height over D0 were D20 and D40. Dry weights increased in the LS soil up to 20 kg P ha−1 and up to 40 kg P ha−1 in the HS soil. Whilst C10 suffered some injury during emergence which also reduced the early growth of that treatment, seed coating at 5 kg P ha−1 resulted in more effective use of P than an equivalent drilled rate in both soil types, particularly with respect to plant height and root weight.
Tài liệu tham khảo
Bache BW and Williams EG (1971) A phosphate sorption index for soils. J Soil Sci 22: 289–301
Barber SA and Kovar JL (1985) Review — principles of applying phosphorus fertilizer for greatest efficiency. Jnl Fert Iss 2: 91–94
Benbi DK and Gilkes RJ (1987) The movement into soil of P from superphosphate grains and its availability to plants. Fert Res 12: 21–36
Brenchley WE (1929) The phosphate requirement of barley at different periods of growth. Ann Bot 43: 89
Colwell JD (1963) The estimation of phosphorus fertilizer requirements of wheat in southern New South Wales by soil analysis. Aust J Exp Agric Anim Husb 3: 190–197
Fox RL and Kamprath EJ (1970) Phosphate sorption isotherms for evaluating the phosphate requirements of soils. Soil Sci Soc Am Proc 34: 902–907
Guttay JR Stritzel JA Englehorn AJ and Black CA (1957) Treatment of corn seed with phosphate. Agron J 49: 98–101
Havlin JL and Soltanpour PN (1980) A nitric acid plant tissue digest method for use with inductively coupled plasma spectrometry. Commun Soil Sci Plant Anal 11: 969–980
Murphy J and Riley JP (1962) A simplified single solution method for the determination of phosphate in natural waters. Anal Chim Acta 27: 31–36
Scott JM and Blair GJ (1988) Phosphorus seed coatings for pasture species. II. Comparison of effectiveness of phosphorus applied as seed coatings, drilled or broadcast applications in promoting early growth of phalaris (Phalaris aquatica L.) and lucerne (Medicago sativa L.). Aust J Agric Res 39: 447–456
Scott JM, Jessop RS, Steer RJ, McLachlan GD (1987) Effect of nutrient seed coatings on the emergence of wheat and oats. Fert Res 14: 205–217
Smid AE and Bates TE (1971) Response of corn to small amounts of fertilizer placed with the seed. V. Seed coating compared with banding. Agron J 63: 380–384
Sutton PJ, Peterson GA and Sander DH (1983) Dry matter production in tops and roots of winter wheat as affected by phosphorus availability during various growth stages. Agron J 75: 657–663
Welch LF, Mulvaney DL, Boone LV, McKibben GE and Pendleton JW (1966) Relative efficiency of broadcast versus banded phosphorus for corn. Agron J 58: 283–287