Factor of regulating the production process of soybean crop in the dry steppe zone of the Republic of Tyva | Факторы регуляции продукционного процесса культуры сои в сухостепной зоне Республики Тыва
2010
Seren, K.D. | Ignat'ev, L.A., Russian Academy of Sciences. Siberian Branch, Novosibirsk (Russian Federation). Institute of Soil Science and Agrochemistry
Microfield trials were conducted with an early ripening variety of soybean SibNIIK-315 for 3 years (2002-2004). The plants were set out after preceding legume crops on low-powerful light chestnut loamy soils. As a background, 45 kg/ha of nitrogen were applied to the soil, in addition to this in different variants of the trial 60 kg/kg of phosphor including in combination with 45 or 90 kg/ha potassium were applied to the soil. No mineral fertilizers were applied in the control. Sprinkling irrigation was conducted until water capacity reached 50-60% or 70-80% relative to the least water capacity. An increase in the intensity of synthesis of overground biomass and grain productivity of soy crops under effect of nitrogen fertilizer was observed in conditions of good natural water supply of plants. Increments of grain yields relative to the control in favorable years were 27.4-31.6%. Under abundant rainfall and soil humidity up to 70-80% the efficiency of nitrogen fertilizers reduced. The positive influence of phosphor fertilizers also exhibited only in the conditions of optimum water capacity. The role of potassium fertilizers in grain productivity regulation was positive under good hydrothermal conditions and negative –under extreme conditions. The soil humidity in the conditions of Tyva maintained at 70-80% is favorable for soy crops
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