锌氮配施对玉米生长及氮素吸收的影响

为明确锌氮配施对玉米生长及氮素吸收的影响,选用大面积种植的郑单958和浚单20两个玉米品种,设置3个氮水平(0.08、4、8 mmol·L~(-1))和3个锌水平(0、10、100μmol·L~(-1)),共9个处理(N0.08Zn0、N0.08Zn10、N0.08Zn100、N4Zn0、N4Zn10、N4Zn100、N8Zn0、N8Zn10、N8Zn100),于2015-06进行水培试验。结果表明,在一定氮素范围内,施锌显著影响玉米幼苗的生长及氮素吸收。在N4Zn100处理下,郑单958和浚单20的株高和生物重数值达到最大;在N4Zn100处理下,郑单958的分根数和根尖数达到最大,而在N8Zn10水平下,浚单20达到最大值;在N4Zn100处理下,郑单958和浚单20的植株氮含量达到最大。而且随着植株氮吸收量的升高,植株氮素生理利用率显著下降。因此,适宜的氮水平下施锌能够调节根系和地上部的关系,促进根系发育和地上部生长,增加根系对氮的接触面积,提高植株对氮素的吸收。

Effect of combined application of Zn and N fertilizers on maize seedlings growth and nitrogen absorbtion

To investigate the effects of combined application of Zn and N fertilizers on maize seedlings growth and nitrogen absorption,two maize varieties,Zhengdan 958 and Xundan 20,which have been planted in large scale,were selected to set up three nitrogen levels (0.08,4,8 mmol · L-1),and three zinc levels (0,10,100 μmol · L-1),included 9 treatments,namely,N0.08Zn0,N0.08Zn10,N0.08Zn100,N4Zn0,N4Zn10,N4Zn100,N8Zn0,N8Zn10,and N8Zn100,and the nutrient solution experiment was carried out in June 2015.The results showed that within a certain range of nitrogen,zinc application significantly influenced the growth of maize seedlings and the absorption of nitrogen.For both Zhengdan 958 and Xundan 20,the plant height and weight reached the maximum value under the N4Zn100 treatment;The root number and root tip number reached the maximum for Zhengdan 958 under N4Zn100 level,and for Xundan 20 under the N8Zn10 treatment;The plant nitrogen concentration reached the maximum for Zhengdan 958 and Xundan20 under the N4Zn100 treatment.And with the increase of plant nitrogen uptake,nitrogen plant physiological utilization rate decreased significantly.Thus,under appropriate rates of nitrogen,zinc fertilizer application can adjust the relations of root system and aboveground parts,promote the growth of root system and aboveground growth,increase the contact area of the root system of nitrogen,and improve plant absorption of nitrogen.