EFFECT OF BORON AND POTASSIUM SPRAY ON QUALITY AND YIELD OF RAPESEED (Brassica napus L.)

Abstract

A field trial was conducted during winter seasons at 2003-2004 and 2004-2005 at field researches of Field Crops Dept., Agriculture Coll., Univ. of Baghdad, by spray of boron concentration (0, 5, and 10 ppm) and its source was boric acid (H3BO3) (6.5% B), and potassium concentration (0, 2000, and 4000 ppm) and its source was sulfate potassium (K2SO4) (42% K) at 75% flowering. The objective was to increase quality and yield of grains of rapeseed (Brassica napus L.). Randomized compete block design with three replicates was used. Plants spray with boron concentration (10 ppm) were superior with number of pods per plant, seeds yield, and oil yield (539.72 pod.plant-1, 1.48, and 0.56) ton.ha-1, respectively at 2003-2004 season, and (537.65 pod.plant-1, 1.47, and 0.56) ton.ha-1, respectively at 2004-2005 season. Plants spray with potassium concentration (4000 ppm) were superior with number of pods per plant, seeds yield, oil yield, and protein yield (567.88 pod.plant-1, 1.53, 0.60, and 0.26) ton.ha-1, respectively at 2003-2004 season, and (568.74 pod.plant-1, 1.53, 0.59, and 0.26) ton.ha-1, respectively at 2004-2005 season. The combination (10 B + 4000 K) ppm was the best, because it gives higher values to all characteristics under study. It could by concluded that number of pods per plant was the important yield components, which response to spray of boron and potassium, which lead to increase seeds yield, and that was confirm by significant positive correlated appearance between these two characteristics at both seasons (0.819 and 0.915), respectively compared with others.