INTERACTION BETWEEN BORON AND POTASSIUM IN COTTON NUTRITION
Liu Wuding, Pi Meimei and Wu Lishu (Huazhong Agricultural University, Wuchang)
In 1983—1984, field and pot experiments were conducted to study the interaction between boron and potassium in cotton nutrition. The main results obtained are summarized as follows: 1. Boron and potassium significantly affected cotton yield and there was also a significant interaction between the effects of B and K on cotton yield. When B was severely deficient, potassium was negatively related to cotton yield and vice versa. 2. Symptoms of B-deficiency were aggravated, while the B toxicity Sympotoms alleviated with increasing K content in the soil. 3. B concentration of cotton leaves markedly increased with increasing of B in soil, and decreased with increasing of K in soil. At B-deficient level, total B absorbed by cotton leaves decreased with increasing of K in soil; at moderate and high B levels, moderate K acclerated but high K inhibited total B absorbed by cotton leaves. There were no difference in K content of leaves at any given B levels in soil. But total K absorbed by the plant decreased at low boron and high boron levels. 4. B deficiency significantly affected the anatomical structure of pollen and peticles, and lots of precipitates accumulated in peticle cells, but no influence by K and B level was found.