Optimization of row-ratios in mechanized hybrid rice seed production: a study on pollen dispersal and seed-setting characteristics at two ecological sites.

3.8 Linear regression analysis of pollen diffusion effects on outcross setting rate As shown in Table 4 , the t -test results indicated that both the number of sterile rows and pollen quantity had highly significant effects on the dependent variable (outcrossing seed-setting rate), with P -values less than 0.01.

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