To investigate the effects of sowing date on light use efficiency and biological yield of different silage maize varieties following wheat harvest in the Ningxia Yinhuang Irrigation Area,a split-plot experimental design was employed.Two silage maize varieties,the early-maturing'Kewo 028'(Z)and the medium-late-maturing'Lihe 629'(W),were selected as the main plots.Three sowing date of 3 days(S1,June 28th),6 days(S2,July 1st),and 9 days(S3,July 4th)after the wheat harvest were set as the sub-zones,resulting in a total of six treatments.The effects of different sowing dates on light use efficiency,dry matter accumulation and biological yield of different va-rieties of silage maize were investigated and fitted to infer the optimum sowing and harvesting periods of different va-rieties of silage maize.The results showed that the treatment Z had higher leaf area index(LAI),light use efficiency(LUE),development degree of photosynthetic production potential(r),dry matter accumulation(DM)and bio-logical yield(BY)than W.The order of LAI in the whole growth period was ZS1＞ZS2＞ZS3.At the later stage of growth(after wheat harvest 95 d),the bottom light transmittal(BLT)and LUE of ZS3 were significantly increased by 13.81％,5.40％and 15.02％,23.49％(P＜0.05)compared with ZS1 and ZS2,respectively.After wheat harvest 107 d,the BY of ZS1 and ZS2 were significantly decreased by 22.47％and 17.37％(P＜0.05)compared to 100 d after wheat harvest,respectively.The treatments were harvested at their optimum harvesting dates and the order of yield size was ZS1＞ZS2＞ZS3＞WS2＞WS1＞WS3.Correlation analysis showed that the LUE of both varieties was highly significant(P＜0.001)positively correlated with its BY and highly significant(P＜0.001)negatively correlated with r.Principal component analysis revealed that ZS2 treatment had the best overall evaluation.In summary,it is recommended that early-maturing varieties in Ningxia Yinhuang Irrigation Area should be harvested after 85 days of growth(sowing 6 to 8 days after wheat harvest),while mid-late maturing varieties should be harvested after 86 days of growth(sowing 5 to 6 days after wheat harvest).
silage maizesowing datelight use efficiencybiological yieldNingxia Yinhuang Irrigation Area
维普
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