Влияние КАС макро- и микроудобрений, регуляторов роста растений и ассоциативного азотфиксатора на урожайность семян озимого рапса
2008
Sedlyar, F.F. | Gurskaya, S.N., Grodno State Agrarian Univ. (Belarus)
Research of the influence of nitrogen fertilizer forms (carbomide-ammonium mixture, ammonium sulphate), trace elements (boracic acid, magnesium sulphate), plant growth regulators (Gidrogumat, Maltamin) and associative nitrogen fixer Azobakterin on yielding capacity of winter rape (Brassica oleifera ) seeds cultivated on sod-podzolic sandy soils of the Republic of Belarus was realized. The maximum yield (39,5c/ha) of winter rape seeds of Lider variety was obtained after the following three-term application of nitrogen fertilizer in the form of ammonium sulphate: 100 kg/ha at the beginning of crop of spring vegetation development + 50kg/ha at the phase of the beginning of flower bud formation + 50kg/ha at phase of full flower bud formation in combination with borom and plant growth regulator Maltamin. In the similar variant the application of nitrogen in the form of carbomide-ammonium mixture the obtained yield was on 2,9 c/ha lower. Application of plant growth regulator Maltamin (3 l/ha) at the phase of full flower bud formation promoted the increasing of seed yield productivity on 1,6-3,2 c/ha, that could prove the efficiency of its application for the observed crop cultivation. Process of boron application was effective in combination with all studied forms of nitrogen fertilizers, and made it possible to obtain the additional yield of 2,5-3,0 c/ha. The highest yield increase (4,1 c/ha) was provided by the associative nitrogen fixer in the second variant. Azobakterin was used with ammonium sulfate (110 kg/ha) and a concurrent application of P70K120 at the stage of the beginning of spring vegetation. In the most productive variant (33,4 c/ha) there was used the three-term application of mineral nitrogen (N100+N50+N20+Azobakterin) that made it possible to save 30 kg/ha of nitrogen fertilizers
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