Formation rule of super-high-yielding and key cultural techniques for Nanjing 44.

In order to provide reference for the farm production,the formation rule of super-high-yielding and its key cultural techniques of Nanjing 44 were researched through specific experiments and demonstration.The results showed that:①Nanjing 44 was a variety with super-high-yielding potential.Effective panicles and grains per panicle of super-high-yielding population varied widely and the yield components could be limited by grains per panicle mainly.The sequence of yield components contribute to the yield from big to small was effective panicles,grains per panicle,seed-setting rate and 1000-grain weight.Increasing effective panicles was best for the yield increase.Meanwhile,increasing grains per panicle and 1000-grain weight was also benefit to improve yield on the basis of the stable and suitable panicle number.Under conditions of this experiment,95%'s confidence interval(CI) for the growth and development of super-high-yielding rice population above 11 250 kg/hm2 yield:effective panicles 2.675×106-2.875×106 in 1 hm2,grains 150.2-166.2 per panicle, seed-setting rate 89.8%-91.6%,1 000-grain weight 28.9-29.6 g,and theoretical yield 11 425.5-11 728.5 kg/hm2.②It was easy for Nanjing 44 to obtain super-high-yielding under the condition of dry-raising seedling and thin-planting when the basic seedlings ranged from 7.2×105 to 8.1×105 in 1 hm2 and the total nitrogen application was about 315 kg/hm2.Under the condition of throwseedling with plastic-plate and wheat straw to soil,it was easy for Nanjing 44 to obtain super-high-yielding when the density and the amount of nitrogen were harmonious with the total nitrogen application ranged from 285 kg/hm2 to 315 kg in 1 hm2 and the planting density was 9.75×105 in 1 hm2.