Effects of Sowing Date, Basic Seedling, Nitrogen Rate and Field Water on Early Rice "Liangyou 9168"

To study the influence of different culture conditions to the growth and yield, an orthogonal experiment was conducted with four factors-sowing date, basic seedling, nitrogen rate and water depth and three levels (L934) about early rice Liangyou 9168 in Jingzhou for 3 years. The results indicated that: (1) Sowing date showed significant effect on growth period, there was a linear negative correlation between sowing date and growth period (y = -0.685x + 127.54, R = 0.9986**). (2) Sowing date and nitrogen rate showed a highly significant effect on yield, the early rice yield of sowing on March 20 was the highest in the experimental range, there was a linear positive correlation between nitrogen rate and yield (y = 0.5963x + 393.43, R = 0.9709**). (3) The best combination of cultural factors for early rice was treatment 5 of sowing on March 19, basic seedling for 67.5×104 kg/hm2, nitrogen amount of 93.58 kg/hm2 and field water just covering mud.