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（三）作物栽培技术的改进和发展我国人多地少，人对自然的选择度极低。不少地方，在别国认为是不适于耕作的，在我国也都开垦利用，种上庄稼。因此，我国的作物栽培技术体系要适应多方面的要求，是十分多样、非常复杂的。（1）它要遵循作物生育规律，满足作物高产的要求；（2
(III) Improvement and Development of Crop Cultivation Techniques There are few people in our country, and people have a very low degree of natural selection. In many places, they are considered unsuitable for cultivation in other countries and have also been cultivated and used in our country to grow crops. Therefore, China’s crop cultivation technology system to adapt to various requirements, is very diverse and very complex. (1) It should follow the law of crop growth, to meet the requirements of high yield crops;