Mulčiavimo liekamasis poveikis dirvožemio agrocheminėms savybėms

Abstract

Subject of the research - red beet {Beta vulgaris var. vulgaris) crop. Two-factor mulching experiment has been conducted in 2004-2009. In Aleksandras Stulginskis University Pomological garden in 2011 the residual effect of organic mulches has been studied. Treatments of the experiment: Factor A - various organic mulches: 1) - without mulch; 2) - straw; 3) - peat; 4) - sawdust; 5) - grass. Factor B - thickness of mulch layer: 1) 5 cm; 2) 10 cm. Soil - drained medium-textured loam on a moraine loam, a carbonate deeper gleyic luvisol Calc(ar)i-Endohypogleyic Luvisol. The research has established that organic mulches' effect on agrochemical soil properties was conditioned by the type and amount of applied mulch. Earlier applied organic mulches have increased the amount of total nitrogen in soil. Substantial increase (0.03 percent points) occurred with peat mulches. The residual effect of straw and grass mulches on the amount of labile phosphorus and calcium in the soil remained for two years. Significantly higher amounts of mobile phosphorus (22.7 %) and mobile potassium (32.9-63.1 %) compared with non mulched fields have been established. Thicker (10 cm) mulch layer significantly increased potassium amount. Earlier applied 10 cm mulch layer has as well increased the total nitrogen and labile phosphorus amounts, but notsignificantly