Phosphorus and potassium migration in different crop rotations

Abstract

The investigations were carried out during 2006-2011 in the land of the Water resources engineering institute of ASU, in village of Lipliūnai on Endocalcari Endohypogleyic Cambisol (CMg-n-w-can). The base of investigations is 3 drainage systems, which contain cereals differing in fertilization and grasses crop rotations. The aim of investigations is to determine the crop rotations differing in fertilization and this relations with cycles of phosphorus and potassium in agroecosystem. Higher productive was perennial grasses crop rotation. In the conditions of cereal crop rotations this productive was 3-46% lesser. The highest concentration of P-PO4 3- in drainage water was received in the conditions of higher fertilization cereals crop rotation while highest concentration of total P and K+ in the conditions of grasses crop rotation. The highest leaching of P-PO4 3- and total P by drainage was received under the conditions of higher fertilization cereals crop rotation. The highest leaching of K+ was received under the conditions of grasses crop rotation. The leaching of P-PO4 3- and potassium essentially depends on fertilization, drainage runoff as well as cumulative and yearly balance of P and K. The application of all crop rotations was distinguished by positive P balance. Cumulative balance of potassium under the conditions of higher fertilization cereal crop rotation was moderate negative. The highest deficit of cumulative potassium balance was received under the conditions of grasses crop rotation. The aim of our investigations is to estimate of dependence of migration phosphorus and potassium on environmental factors.