茄子/大葱间作及氮肥调控对植株硝酸盐含量及养分吸收的影响

作物根系分布深度不同,其吸收养分的土壤区域也有所不同。采用大田试验方法,选择深根系的茄子和浅根系的大葱进行间作种植,并辅以氮素调控措施,研究其对蔬菜硝酸盐含量及养分吸收的影响。研究表明,无论是常规施肥还是减量施肥,间作均能降低蔬菜体内硝酸盐含量。间作区茄子的生物量和吸氮、磷、钾量均高于单作区,而间作区大葱的生物量及吸氮、磷、钾量均有所降低。说明在这一间作模式中,茄子处于优势地位,而大葱处于劣势地位。

Effect of Intercropping and Nitrogen Regulation on Nitrate Accumulation and Nutrient Uptake of Eggplant and Green Onion

Vegetables with different root depth have different nutrient uptake characters.In this research,a field experiment with different cropping system,intercropping and monocropping,and different nitrogen fertilizer amount input was conducted to study effects on nitrate content and nutrient uptake of vegetables.This study chose eggplant and green oniontg as experimental crops.The results showed that nitrate contents in vegetable tissues were decreased observably in the intercropping system compared with the monocropping system whether under normal fertilization or optimal fertilization conditions.The biomass and nutrient uptake value of eggplant in the intercropping system were higher than in the monocropping system under different fertilization conditions,while the biomass and nutrient uptake value of green onion in these systems presented the opposite results,which means that in the eggplant and green onion intercropping system eggplant has advantage in nutrient absorption.