[Dynamics of sweet sorghum yield formation and its dependence on the degree of nitrogen nutrition]
2006
Shlapunov, V.N. | Lukashevich, T.N. | Nadtochaeva, I.A. | Kapylovich, V.L.(The National Academy of Sciences, Minsk (Belarus). Institute of Arable Farming and Selection)
Agricultural and climatic resources and soil conditions of Belarus formed the favourable conditions for the cultivation of annual sweet sorghum (Sorghum saccharatum), high yielding, rought-resistant culture for silo preparation. The reaction of sweet sorghum to different doses of nitrogen fertilizers was revealed. Research results showed that in the process of planning of terms and doses of fertilizers it was necessary to take into consideration that sweet sorghum developed 17-18% of green mass in 42-48 days after shoots sprout, 53-56% - in 52-58 days, 70-73%, – in 62-68 days, 84-88 % - in 72-78 days. The possibility of two cuttings of sorghum per year was analyzed. The opportunities of two cuttings of sorghum were constrained by the agricultural and climatic resources of vegetation period. Two-times cutting was possible under realization of the first one in the phase of leaf tube formation (in 45-55 days after shoots) that corresponded to the V stage of sorghum ontogenesis. Research results showed that 60–90 kg/he was the optimal dose of nitrogen for sorghum seedlings on the sod-podzolic and light-textured soils with the medium fertility (2,0% of humus). It provided 620-670 c/he of sorghum green mass, 10,6-11,0 thousand of feed units per hectare. The payback of 1 kg of nitrogen depending on a dose was 23,7–20,2 of feed units
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