Effectiveness of borax and colemanite as boron sources for rice grown in flooded acidic sou

摘要

A field study was conducted to evaluate the effectiveness of boron fertilizers borax and colemanite (powder and granular) in supplying B to rice under flooded conditions. Boron application improved all the agronomic growth parameters and increased theyield. Both B fertilizers significantly increased the plant height, panicles/plant, number of grains/panicle and weight of 1000 grains. Both B sources were found equally effective in supplying B to rice crop. Borax gave significantly high yield at 2 kgB/ha and powder colemanite at 3 kg B/ha. Yield difference between borax and powder colemanite was not significant at all three levels. Powder colemanite applied plots had significantly high residual B in compare to borax at 0-15 and 15-30 cm and at 30-45cm depth borax applied plots had high B content. Granular colemanite application did not significantly increase the crop growth and yield due to the large particle size B so that release was very slow.