Available nutrients and forms of N, P and K of soil as influenced by different land use systems of an alfisol.
Jalalzai S. W., Parama V. R. R., Atheefa Munawery
Author Affiliation: Department of Soil Science and Agricultural Chemistry, College of Agriculture, UAS, GKVK, Bangalore - 560 065, India.
Mysore Journal of Agricultural Sciences 47 : 252-260
Abstract : The available nutrients and forms of nitrogen, phosphorus and potassium in different land use systems of an alfisol was studied. The main aim was to assess status of major, secondary and micronutrients; forms of N, P and K and organic carbon stocks of agriculture, horticulture and forest land use systems located at Gandhi Krishi Vigyan Kendra campus of the University of Agricultural Sciences, Bangalore. The agriculture systems included - dry land, finger millet, pulse and long term fertilizer experiment plots; horticulture included - grapes, mango, sapota and guava plantation and forest systems included - Simaruba glauca, teak wood and mixed forest plantation. Twelve soil samples (0-15 and 15-30 cm) were drawn during July 2009, processed and analysed using standard procedures. The different forms of phosphorus (Fe-P 225.93, Ca-P 70.56, organic-P 134.22 mg kg-1 and water soluble-K was 11.47 mg kg-1) recorded higher in agriculture system. The horticulture land use system recorded higher available (N 291.61, P 682.95, K 487.66 kg ha-1, S 39.85 mg kg-1 total N, P and K, 2339.90, 1799.53 and 7862.93 kg ha-1 respectively, different forms of N, NH4-N 80.86, NO3-N 21.67, amino-N 228.29, forms of P-saloid-P 10.77, Al-P 112.27, and exchangeable-K 59.17 mg kg-1). While non-exchangeable K (94.21 mg kg-1) was highest in forest land use system.