The residual effect of fertilizer application of granulated organic-mineral fertilizers formed from spent mushroom substrate on pH of soil

Abstract

Spent Mushroom Substrate (SMS) were used to formed granulated organic-mineral fertilizers. Four granulated organic-mineral fertilizers were formed from Spent Mushroom Compost (SMC) before granulation supplemented by mineral fertilizers (urea, single superphosphate, K salt, ammonium saltpeter, ammonium sulfate). Two granulated organic-mineral fertilizers were based on compost from Spent Mushroom Compost and sewage sludge and one of them was supplemented by ammonium sulfate before granulation. The pH-value of the fertilizers range from 6.17 to 6.94. Fertilizers and composted Spent Mushroom Substrate are using on two doses on account of applied nitrogen content, these doses are 100 and 200 kg N ha-1. 10 fertilizers combinations on four replications are used in experiment. These organic-mineral fertilizers were applied just before planting first test plant – common cabbage. Second test plant – corn and third test plant – oat were grown without fertilization in these same vases-ground. Organic-mineral fertilizers are excellent source of macronutrients (22.0-83.0 g N∙ kg-1, 6.70-18.50 g P∙ kg-1, 2.70-27.0 g K∙ kg-1, 41.1-71.3 g Ca∙ kg-1, 3.1-4.3 g Mg kg-1, 18.7-101.6 g S∙ kg-1) and organic matter (182.8-411.3 g Corg ∙ kg-1). After application the residual effect on pH of soil was observed. The soil pH-value on every object with fertilization was changed compare to control object without fertilization. Increased pH-value first year (5.35-5.92), second year (4.71-5.19) and third year (4.28-4.71). After harvest were collected samples of soil, prepared to physical and chemical analyses and estimated pH-value of soil. Statgraphics 4.0. program was using to statistic data processing of the results.