Response of yield formation of silage maize to irrigation amount in Hexi Corridor irrigation area
[Objective]This study aimed to evaluate the effects of different irrigation rates on the diurnal varia-tion of photosynthesis,agronomic traits,and yield of silage maize in Hexi Corridor irrigation area,to identify the opti-mal irrigation rate.[Method]A field experiment was conducted in 2022 at Huarui farming,Minle county,Gansu prov-ince,China,using silage maize(Jinling 67)as the research material.Four irrigation rates were applied:4 920 m3/hm2(W1),5 535 m3/hm2(W2),6 150 m3/hm2(W3)and 6 765 m3/hm2(W4).The effects of irrigation on the photosyn-thetic characteristics,agronomic traits,and yield of silage maize were analyzed.[Result](1)The daily averages of net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),intercellular CO2 concentration(Ci),and chlorophyll(SPAD)followed the trend W2>W3>W4>W1.The W2 treatment increased Pn,Tr,Gs,Ci,and SPAD by 7.51%～29.21%,11.91%～47.09%,12.84%～31.82%,6.94%～23.40%,and 7.65%～11.42%,re-spectively,compared to other treatments.(2)The stem diameter of silage maize increased rapidly from the seedling to jointing stage,with W2 significantly higher than other treatments(P<0.05)and reaching its maximum at matu-rity.W2 treatment resulted in 6.28%～14.17%increase in stem diameter.Plant height and leaf area index also in-creased rapidly until the tasseling stage,where W2 treatment was significantly higher(P<0.05),showing increases of 2.95%～19.27%and 1.57%～8.07%,respectively,at maturity compared to other treatments.(3)The W2 treat-ment significantly increased the biomass of maize silage(P<0.05).Specifically,the W2 treatment showed an in-crease of 0.87%compared to the W3 treatment.[Conclusion]An irrigation rate of 5 535 m3/hm2 yielded the highest silage maize production under local traditional fertilization conditions.Adequate irrigation enhances crop photosyn-thetic capacity,promotes dry matter accumulation,and improves growth conditions and yield of crops.
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