Effects of Different Sizes of Water Retaining Agent Combined with Nitrogen Fertilizer on Wheat Photosynthetic Characteristics and Grain Yield
Feng Bo
Li Guofang
Li Zongxin
Wang Fahong
Abstract：Two sizes of water retaining agents (WRA)combined with different nitrogen application rates were designed to study their effects on photosynthetic characteristics and grain yield of wheat.The results showed that the wheat yield increased significantly by high nitrogen application (20 kg pure nitrogen per 666.7m2 );the yield increased significantly under the treatments of combined application of nitrogen fertilizer and WRA;combined application of larger size of WRA could significantly increase the wheat yield compared to the smaller size of WRA under the same application of nitrogen.The NDVI value was higher under larger size of WRA treatments than that of smaller size of WRA treatments at wheat jointing,anthesis,middle grain -filling stages and later grain -filling stage.Under the same nitrogen application,the net photosynthetic ratio (Pn)of flag leaves was higher under the larger size of WRA treatments than that under the smaller size of WRA treatments,even at later grain -filling stage.The differences in Pn of flag leaves between the treatments of 0.5 kg and 1.0 kg WRA per 666.7m2 was not significant under the same nitrogen application rate and WRA size.The photosynthetic water use efficiency (WUEphoto)showed a decreasing trend at the whole fill-ing stage,and it was higher when combined with larger size of WRA than that with smaller size of WRA.The treatment with 20 kg pure nitrogen combined with 0.5 kg 1.6 ~4.0 mm WRA per 666.7m2 was optimum, which could improve the population status of wheat in later growth period,increase the Pn and WUEphoto of flag leaves,and the grain yield of wheat.
Keywords：Water retaining agentNitrogen fertilizerPhotosynthesisYieldWheat
Publication Date：2015-09-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 80-84 )