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.