Chlorophyll fluorescence characteristics of early-maturing both grain and forage multiple cropping corn in the southern Xinjiang
[Objective]The study aimed to ascertain the optimal planting density for early-maturing dual-purpose corn varieties(grain and forage)for multiple cropping in the southern Xinjiang region,and to investigate the variation patterns of chlorophyll fluorescence characteris-tic parameters across different densities as well as their correlations with yield formation and to provide a scientific basis for enhancing the multiple-cropping corn cultivation technology in the southern Xinjiang region.[Method]The research employed two early-maturing grain-feed dual-purpose new breeds of maize,XL1822 and XL1903,as research materials.Two distinct densities were used for the investigation,high and low(9.00 × 104 plants/hm2 and 11.25 × 104 plants/hm2 respectively).The research explored the characteristics of chlorophyll fluores-cence,main agronomic traits,matter accumulation and yield formation,in multiple cropping corn under different density conditions in the southern Xinjiang of China.[Result]The XL1822 maize,when grown in low-density conditions,exhibited higher levels of actual photo-chemical quantum yield of[Y(Ⅱ)],coefficient of photochemical fluorescence quenching assuming(qL),and PS Ⅱ reaction center activity during the jointing stage,big horn mouth period,silk-spinning period,and filling stage.The XL1903 maize,under high-density conditions,revealed elevated Y(Ⅱ)and qL during ointing stage,big horn mouth period,silk-spinning period.The SPAD value of the XL1822 maize during the silk-spinning period,filling stage and maturation stages under low-density conditions was slightly higher than that under high-den-sity conditions.The SPAD value of the XL1903 maize throughout its growth period was higher under high-density conditions.The XL1822 maize,when grown under low-density conditions,exhibited a seed rate yield of 9250 kg/hm2 and a dry matter accumulation of 15 590 kg/hm2,significantly outperforming high-density cultivation.Conversely,the XL1903 maize under high-density conditions had a seed rate yield of 9065 kg/hm2 and a dry matter accumulation of 19 095 kg/hm2,significantly higher than those under low-density cultivation.[Conclu-sion]Elevated chlorophyll fluorescence characteristic parameters and SAPD values establish a solid foundation for corn yield formation and dry matter accumulation.Both the extremely early-maturing variety XL1822 under low-density treatment and the early-maturing variety XL1903 under high-density treatment exhibit notably higher Y(Ⅱ)values,qL,and PSⅡ reaction center activity during critical growth stages.Consequently,the recommended planting densities for XL1822 and XL1903 in the southern Xinjiang region are 9 x 104 and 11.25 x 104 plants/hm2,respectively,to achieve optimal yields.
Multiple croppingEarly-maturingExtremely early-maturingChlorophyll fluorescence characteristicsBoth gratin and forage cornYield
万方数据
维普
