Influence of fertilizer system on nutrients balance and agrochemical indexes of sod-podzolic loamy sand soil | Влияние систем удобрения на баланс элементов питания и агрохимические показатели дерново-подзолистой супесчаной почвы
2012
Seraya,T.M. | Mezentseva, E.G. | Bogatyreva, E.N. | Biryukova, O.M. | Biryukov, R.N., National Academy of Sciences. Scientific and Practical Center for Arable Farming (Belarus). Institute for Soil Science and Agrochemistry
Balance of nutritive elements is an important part of a system 'soil-plant-fertilizer', it reflects the main courses of transformation and consumption of nutritive substances of mineral and organic fertilizers by plants. Intensive utilization of arable lands under crop rotations leads to misbalance between input and output of nutritive substances and causes soil fertility decline. Evaluation of the influence of organic, mineral and organo-mineral fertilizing systems on nutritive elements balance along with agrochemical indexes of sod-podzolic loamy sand soil is presented in the article. Balance of humus during one cycle of crop rotation on sod-podzolic loamy sand soil with straw plowback is evaluated. Balance of nutritive elements is calculated, too. Influence of fertilizers on humus content changes on sod-podzolic loamy sand soil is analyzed. Impact of fertilizing system on changes of agrochemical characteristics of the soil is investigated. The following conclusions are made: on sod-podzolic loamy sand soil at high efficiency of crop rotation (473,9 centner of fodder unit) N433P290K590 application against 60 t/hectare of manure is insufficient for preservation of humus content in soil at initial level, this rate of fertilizers has provided only a small gain of mobile forms of phosphorus and potassium; due to straw plowback the humus content in soil has increased on 0,04-0,07%, mobile forms of P2O5 - on 8-16 mg/kg, K2O – on 20-29 mg/kg.
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