Effects of Spraying Micronutrients on the Growth and Nitrate Content of Chinese Chive in Sand Culture

The present investigation was carried out under solar greehouse conditions,to study the effect of micronutrient foliar application on plant growth and nitrate content of Chinese chive while the seedlings was irrigated with nutrient solution of high level nitrate nitrogen in sand culture.The micronutrient used in this experiment included molybdenum(Mo),manganese(Mn),boron(B),iron(Fe),and zinc(Zn).The results showed that the nitrate content in Chinese chive leaves was significantly decreased by foliar application of Mo or B and had a fall of 20.4%~32.4%.But the biomass of Chinese chive was not improved by spraying either Mo or B.In spring spraying micronutrient of Mn or Fe could markedly reduce the nitrate content in Chinese chive leaves which went down by 14.7%and 13.9%respectively.Spraying either Mn or Fe could also increase the chive's biomass per plant,and the fresh mass per plant went up by 17.6%,13.3%,and the dry mass per plant went up by 17.3%,18.1% respectively.In low temperature time of late autumn to early winter Chlorophyll content in Chinese chive leaves could be improved by foliar application of Mo.