Abstract:

Abstract: In order to study the effects of the nitrogen forms in nutrient solution on the pakchoi cabbage, the effects of partial replacement of nitrate in solution by nitrogen forms (ammonium nitrogen; amide nitrogen; amino acid nitrogen) on the development and quality of hydroponic pakchoi cabbage were studied based on the South China Agricultural University nutrient solution formula B for leaf vegetables. The results showed that the growth and the yield of hydroponic pakchoi cabbage were increased remarkably, when the partial nitrate in solution were replaced by amino acid nitrogen and amide nitrogen. The chlorophyll and carotenoid content of the hydroponic pakchoi cabbage were raised, when the partial nitrate in solution were replaced by ammonium nitrogen. The root vigor of the of the hydroponic pakchoi cabbage was the highest, when the nitrogen in solution were all nitrate; the root vigor was lowered, but the soluble sugar, soluble protein and Vitamin C content of the hydroponic pakchoi cabbage were raised when the partial nitrate in solution were replaced by amide nitrogen. The nitrate content of the hydroponic pakchoi cabbage was lowered remaekably when the part of nitrate was replaced by other nitrogen forms, especially by amide nitrogen. In this experiment, the cultivation effect of the hydroponic pakchoi cabbage was the best when the partial nitrate in solution was replaced by amide nitrogen.