杂交水稻具有茎秆粗壮,根系发达,分蘗力强,穗大,粒多,粒重,产量高等明显的增产优势。几年来,我室在中等以上肥田进行高产试验,早、晚造都稳定在每造亩产1100—1200斤水平。为了了解杂交水稻产量优势的内在因素,我们对一些生理指标进行了测定和比较,初步认为杂交水稻产量优势的生理因素有如下几方面。 Hybrid rice has stem sturdy, developed roots, tillering ability, spike, grain more, grain weight, higher yield significantly higher yield advantage. Over the past few years, my room in middle-grade fertilizer field for high-yield test, early and late to make stable at 1100-1200 pounds per mu level. In order to understand the inherent factors of yield superiority of hybrid rice, we measured and compared some physiological indexes. The physiological factors of yield superiority of hybrid rice are preliminarily considered as follows.