| With different stable yield varieties of Double cropping early rice Ganxin 203,Ganxin 206 and late rice Changyou 10,Wufengyou T025,were used to study the compensation effect of weak seedling and transplanting density (static) on the growth of double cropping rice varieties and its relationship with yield stability.Results are as follows:1.The relationship of different seedling quality and compensation effect and yield stability in varieties of double cropping rice(1) Yield and yield components of early or late rice in Weaked has declined. early rice production declined 6.23%(Ganxin 203) and 8.06%(Ganxin 206), late rice production declined 5.03%(WuFengyou T025) and 7.49%(Changyou 10); coefficient of variation of rice yield were 4.60%(Ganxin 203) and 5.69%(Ganxin 206),4.20% (WuFengyou T025) and 5.89%(Changyou 10 hao); compensation effect of weak seedling treated with the growth of Ganxin 203 is stronger than Ganxin 206, WuFengyou T025 stronger than Changyou 10, and yield stability are better. Compensation effects of Panicles per plant, seed growth rate and grain weight in Ganxin 203 were higher than Ganxin 206, WuFengyou T025 higher than 10, compensation effects of per panicle of Ganxin 203 was less than Ganxin 206, WuFengyou T025 better than Changyou 10.(2) The compensation for rice growing ability of dry matter accumulation, spike rate, the actual number of spikelets, panicle length, primary branches, spike angle, leaf angle and leaf length in Ganxin 203 were better than Ganxin 206, WuFengyou T025 better than Changyou 10; The compensation for rice growing ability of secondary branches, leaf area index, leaf weight and leaf width in Ganxin 203 was less than Ganxin 206, Wufengyou T025 better than Changyou 10.(3) Chlorophyll of different varieties were decreased, the chlorophyll content between different treatment in Ganxin 203 and WuFengyou T025 were less, indicating the compensatory effects under weak seedling of leaf photosynthetic capacity in Ganxin 203 and WuFengyou T025 were stronger; magnitude difference of root exudate of different varieties between different treatments in Ganxin 203 were less than Ganxin 206, WuFengyou T025 less than Changyou 10, indicating the compensation capacity of root formation under weake seedling in Ganxin 203 and WuFengyou T025 were stronger.(4) Endogenous hormone content changes:increase of ABA(abscisic acid) content under weaken treatment in Ganxin 203 and WuFengyou T025 were smaller, indicating the later leaf senescence was slower. ZR(zeatin) content was declining with the growth of increased amplitude, the increased magnitude in Ganxin206 and Wufengyou T025 were smaller. IAA (indole acetic acid) content change was first increased and then decreased, the declined magnitude in Changyou10 and Ganxin203 were smaller. (IAA+GA+ZR)/ ABA ratio:(IAA+GA+ZR)/ABA ratio in early rice varieties was reducing, the differences in times in Ganxin 203 were less than Ganxin 206; (IAA+GA+ZR)/ABA ratio changes in late rice was the highest in heading, then decreased. The differences of prephase in Wufengyou T025 were less than Changyou10,optimal. Later were not significant. Overall, the relationship between the hormone in Ganxin203 and WuFengyou T025 were more balanced.2.The relationship of planting density growth and compensation effect and yield stability in varieties of double cropping rice(1) The early rice yield in low density was highest, high density slightly lower than the normal density; the late rice yield under high and low density were both increase, high-density were higher. Compensation capacity of production under high-density in Ganxin203 and Wufengyou T025 were stronger,under low density in Ganxin 203 and Changyou 10 were stronger. Yield stability under Densities in early rice Ganxin 203 and late rice Wufengyou T025 were better. In low density,compensation effect of per panicle, seed setting rate, grain weigh in Ganxin 203 were stronger, panicles per plant, seed setting rate and grain weight in Changyou 10 were stronger; under high density, compensation effect of panicles per plant, seed setting rate and grain weight in Ganxin 203 were stronger, panicles per plant, grain weight in Wufengyou T025 were stronger.(2) In low density, spike rate, the actual number of spikelets, panicle length, branch number were the highest, the growth compensation effect in early rice Ganxin 203 and late rice Wufengyou T025 were stronger; leaf area index and leaf weight under high and low density has increased, but the compensate ability in Ganxin 206 and Changyou 10 were stronger.(3) Chlorophyll content under high density in Ganxin 203 and Changyou 10 were up, Ganxin206 and Wufengyou T025 were down, low density Changyou10 and Ganxin 203 were less decline, in general, Ganxin 203 and Wufengyou T025 compensation more stable. Compensate ability of root bleeding strength under low and high density in Ganxin 203 and Changyou 10 were stronger.(4) Endogenous hormone content changes:the decline magnitude of ABA (abscisic acid) content under high and low density in Ganxin 203 and Wufengyou T025 were higher; the increase magnitude of ZR(zeatin) under high-density in Ganxin 203 and Changyou 10, under low-density in Ganxin 206 and Changyou 10 were higher; the increase magnitude of IAA (indole acetic acid) under high density in Ganxin203 and Wufengyou T025, low density in Ganxin 206 and Wufengyou T025 were higher; GA (Red enzymes) under high density in Ganxin 203 and Changyou 10, low density in Ganxin 203 and Wufengyou T025 were higher. Balanced relationship between hormones (IAA+GA+ZR)/ABA ratio:under high and low density, the early rice Ganxin 203 and late rice Wufengyou T025 were higher in increase magnitude.
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