Growth characteristics of rice seedlings using direct sowing technology

To search the optimum planting technology of rice direct sowing and its corresponding production mechanization, the contrast paddy-field experiments on direct sowing of baby rice seedlings, the rice transplanting, and the rice broadcasting were done in Jingertun village of Liaoyang. The growth characteristics of the root length, amounts and the height of baby rice seedlings during the breeding period were studied. It was showed that the operation of training seedling had the restrained effects on the increment speed of the root length and the height of the baby rice, but it did not affect the increment of the amounts of the roots. Compared to the routine sowing methods, the direct sowing technology of baby rice seedlings has the advantages as follows, growing quickly in the period from May 20 to July 27, tillering and heading earlier and the node of tiller lower. But the method had the shortcoming of the lower effective tiller ratios because of heavy sowing densities. The spike density of the baby rice sowing was 5387000 head/hm², the grain ripened of each spike was 76.8, and the one thousand-grain-weight was 0.0246 kg.