Effects of Irrigation and Foliar Nitrogen Application on Yield,Quality and Photosynthetic Characteristics of Late Sowing Wheat
In response to the problem of delayed sowing date affecting the growth of wheat in production,spring irrigation and foliar nitrogen application were used as the main cultivation measures to study the effects on the yield and quality of late sowing wheat.Using split-split plot design,the main plot was the variety,and two strong gluten cultivars"Gaoyou 2018"and"Shiluan 02-1"were selected.The subplot was the spring irrigation treatment.Four irrigation levels were set:W0(no irrigation),W1(900 m3/ha irrigation at the jointing stage),W2(450 m3/ha irrigation at the jointing stage and flowering stage)W3(irrigation of 300 m3/ha at jointing stage,flowering stage and filling stage).The split-split plot was foliar nitrogen application at ten days after flowering,and three levels were set:N0(no nitrogen fertilizer),N1(1％nitrogen)and N2(2％nitrogen).The results showed that the yield of Gaoyou 2018 was higher than that of Shiluan 02-1,but the processing quality of the latter was generally better than the former.Under late sowing condition,when the total amount of spring irrigation was the same,the average yield of W3 was the highest,which was 10 430.9 kg/ha,the yield was shown as W3＞W2＞W1＞W0.Compared with W0,irrigation at the jointing and flowering stage could significantly increase the 1000-grain weight of wheat,with an average increase of 5.9％.Foliar nitrogen application at filling stage can significantly increase the yield and 1000-grain weight of late sowing wheat,with an average increase of 288.8 kg/ha and 0.93 g.Irrigation at jointing stage could increase the LAI.Irrigation at flowering could increase the SPAD and Pn of flag leaves,respectively.The SPAD and Pn of W3 at the middle filling stage were higher than the other treatments with significant differences,respectively.Compared with W0,spring irrigation reduced the processing quality of late-sowing wheat,W1 W2,and W3 reduced protein contents,wet gluten contents,and sedimentation.Compared with N0,N1 and N2 increased protein contents,wet gluten contents and sedimentation values.Therefore,for late sowing wheat,appropriate irrigation treatment in spring and foliar nitrogen application at the early filling stage can improve yield and quality to a certain extent.
Late sowingWheatIrrigationFoliar nitrogen applicationYieldQuality
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