Effect of Fertigation of Water-Soluble Fertilizers on Growth, Yield of Cowpea and Nutrients Availability in Soil under Rice-cowpea Cropping Sequence
T. Jayanthi *
Department of Soil Science and Agricultural Chemistry, UAS, GKVK, Bangalore, Karnataka, India.
H. S. Latha
Department of Agronomy, AICRP for dryland Agriculture, University of Agricultural Sciences GKVK Bangalore, Karnataka, India.
Savitha Madappa
Department of Crop Physiology, University of Agricultural Sciences GKVK Bangalore Karnataka, India.
Nunavath Umilsingh
Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India.
H. R. Umesh
Department of Soil Science and Agricultural Chemistry, AICRP on LTFE, UAS, GKVK, Bangalore, Karnataka, India.
Ashok. L. B
Department of Soil Science and Agriculture Chemistry, College of Agriculture, Karekere, Hasan, Karnataka, India.
*Author to whom correspondence should be addressed.
Abstract
A investigation was carried out to study the Growth and yield of cowpea and primary nutrients availability in soil as influenced by fertigation of water-soluble fertilizers under rice-cowpea cropping sequence. Hybrid rice was tested under aerobic condition during Kharif 2015-16 and 2016-17 with 16 treatments replicated thrice in randomized block design. The results indicated that, the treatment, 100% RDF through water soluble fertilizer at 8 DI was recorded significantly higher growth and yield determinants, higher seed yield (12.94 q ha-1) and haulm yield (26.17 q ha-1) of cowpea. Significant higher organic carbon (0.57 %) was recorded with the application 100% STCR dose with WSF through fertigation at 8 DI and higher available N (146.38 kg N ha-1 ), P2O5 (122.67 kg P2O5 ha-1 ) and K2O (130.17 kg K2O ha-1 ) content in soil recorded 100% water soluble fertilizers (WSF) applied at 4 DI. However, exchangeable calcium [3.51 cmol (p+) kg-1], magnesium [2.55 cmol (p+) kg-1], available sulphur [12.50 ppm] in soil were recorded with 100% conventional fertilizers applied plots through PoP. Significantly higher DTPA extractable Fe (18.45 mg kg-1) noticed with 100% STCR of WSF at 8 DI. However, significantly higher DTPA extractable Zn (1.44 mg kg-1) and Cu (0.57 mg kg-1) was recorded with the application of 100% RDF with WSF at 4 DI. Significantly higher DTPA extractable Mn (22.78 mg kg-1) noticed with 100% STCR of WSF at 4 DI.
Keywords: Fertigation, sol test crop response, water soluble fertilizer, conventional fertilizer, cowpea, soil properties