First of all, it doesn't mean that rice can't be thrown directly into rice fields. It depends on whether Hainan, Guangdong, Fujian and other southern regions can plant two seasons a year. Some areas should consider direct seeding, such as Jiangxi, Zhejiang, Hunan and the north of the Yangtze River. This is mainly because in previous areas, rice was basically unaffected by the weather. As we all know, Guangdong has four seasons like spring, and such weather conditions are more suitable for direct seeding of rice. In addition, due to soil reasons, some seedlings need to be harvested and transplanted in advance in order to catch up with the season, so it can be seen from this point that transplanting is more suitable than sowing if you want to improve the multiple cropping index.
Secondly, if you want to sow directly in the rice field, it will be about half a month earlier than normal sowing. In this half month, the cold in late spring can easily freeze the seeds. Moreover, if you plant seeds in rice fields at will, the planting density will be uneven, some are too dense, some are too scattered, some are growing well, and some are very poor, which is very unfavorable to future agricultural work. You know, the yield of rice depends on the later management, and the weather also has a certain influence. Compared with the transplanting method, it can directly turn green when transplanting in the field, saving a lot of time and obtaining more accumulated temperature.
In fact, not only rice, but also many horticultural crops, such as vegetables, flowers and other industries, often adopt the method of centralized seedling raising first and then transplanting in the field. The reason is as mentioned above. However, it is not that the live broadcast is not good. Now the direct seeding of rice has been popularized, which has solved the problem of weeding in direct seeding fields. The yield is not lower than that of transplanting field, which saves time and labor. But why can it be broadcast directly in the United States mainly because of its great position in the United States? Do you think it's credible that you let him transplant rice seedlings one by one? More importantly, the United States has a large area and a large amount of planting, and the overall production efficiency will not be affected by a bad output value.
In a word, there is mechanical transplanting now, and it is no longer just artificial planting as before. The era that loess faces is also the result of our scientific and technological progress, and it is also the performance of human civilization progress. To sum up, the main reasons why rice adopts this planting method are meteorological reasons and weeding problems in the later stage. The most important thing is to ensure the stability of output value.