Influence of pre-season crops on productivity of rice (Oryza sativa)-sunflower (Helianthus annuus) sequences and soil- fertility status
Year: 2001
Type: article
Abstract: A field experiment was conducted during 1989-90 and 1990-91 at Bangalore. Fodder maize (Zen tncrys L.) and green-manure crops, viz. Sesbnnin rostrntcr, sunnhemp (Crotnlorin juncen L.) and soybean [Glycine mrrr (L.) Mill.], were grown as sole crops and as intercrops, viz, maize + sunnhemp, maize + S. rostrtrtcl and maize + soybean in I : I proportion, preceding rainy-season rice (Oryzn sntivn L.). There was a preceding fallow treatment. Green-manures were incorporated into the soil before planting rainy-season rice. Their effects on yield of rice, sunflower and soil-fertility status was studied. Pre-season green-manure crops, viz. S. rostrntn and sunnhemp, improved the nitrogen, phosphorus and potash contents of the soil under rice-sunflower sequence. The biomass yield and the total productivity of rice and sunflower was maximum with S. rostrntn green-manure, followed by sunnhemp green-manure. Incorporation of the green- manure crops grown as intercrop with maize + sunnhemp, maize + S. rostrnm and maize + soybean or sole soybean did not improve the yield significantly. The organic carbon, available N, P and K contents of the soil improved on inclusion of sunnhemp or S. rostrntn in the sequence. Biomass yield and economic yield of nce and sunflower wCre highest with 100 kg Nlha.
Source: Indian Journal of Agronomy
Authors: SHARANAPPA, B. SHIVARAJ
Institution: University of Agricultural Sciences, Bangalore
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDGs: Zero hunger, Life on land
Open Access status: bronze
OpenAlex ID: W4390289558