The Effect Of Excessive Phosphate Fertilizer On Mineral Nutrient Uptake Of Chinese Cabbage Species

Phosphorus is one of the necessary elements for plants. The available phosphorus content in the soil has been continuously increasing with the extensive application of phosphate fertilizer in China's agricultural production. The phenomenon of excessive application of phosphate fertilizer in facility agriculture is more universal. Excessive application of phosphate fertilizer is not only a waste of resources, increasing production costs, and also increase the risk of pollution of the environment. In addition, crop production, even the quality of crops and particularly the content of other nutrients and biological effectiveness will be affected in high phosphorus status. Calcium and zinc have a decisive function on human growth and metabolism. How to improve Ca and Zn contents of vegetable and absorbable Zn for human is signality to improve vegetable commodity value and further human health.A lot of phosphate fertilizers were applied in vegetable production with a negative impact on growth and nutrient uptake of vegetables. For these reasons, the growth and nutrient uptake of Chinese cabbage species were studied under excessive phosphate fertilizer by the pot experiment and field experiment, so we can explore the mechanism of mineral nutrients absorption and transportation in the plant, which was ordered to provide the basis of high yield, good quality (human health) and scientific application of phosphate fertilizer in Chinese cabbage species production. The results were as follows: The application of phosphate fertilizer significantly increased the biomass of rape and Chinese cabbage, while there was no yield response when phosphate fertilizer rate was increased.Proper amounts of phosphate and calcium fertilizers can promote the growth of rape, while it may affect the rope growth when phosphate and calcium fertilizer rate was increased.There was no significant effect on rape growth when the phosphate and zinc fertilizers were applied.The total P in rape and Chinese cabbage shoot and root was increased gradually with the increase of phosphate fertilizer rate, while the total N, K was not changed. There was a positive correlation between the concentration of total P and application of phosphate fertilizer in plant shoot and root. The total N, P, K in rape shoot and root had no significant change with the increasing of zinc. Phosphorus was absorbed luxuriously with excessive rate of phosphate fertilizer.The total Ca, Zn concentrations in rape and Chinese cabbage shoot were decreased with the increasing application rate of phosphate fertilizer. There was a negative correlation between the total P and the total Ca, Zn concentrations in rape and Chinese cabbage shoot. The total Ca in rape and Chinese cabbage root had no significant change with the excessive phosphate fertilizer. The total Ca, Zn concentrations in rape were increased respectively with the increase of calcium or zinc fertilizer rate. There was a positive correlation between the application of phosphate fertilizer and P/Ca, P/Zn in rape and Chinese cabbage shoot.There was a positive correlation between the phosphate fertilizer rate and soil Olsen-P concentration. The phosphate fertilizer rate showed no significant effect on soil available zinc, while the soil available zinc was increased with the application of zinc, and the soil available zinc was increased gradually with the increase of zinc fertilizer rate.