这是由于没有工业生产的化学物质的帮助，有机农场里的作物必须更努力的生长以保护自身。因此它们成熟后不会更有营养。
The idea is that, without help from industrial chemicals, plants on organic farms need to work harder to protect themselves. They end up becoming more nutritious as a result.
农民们使用这些物质来帮助作物生长，以及保护他们免受虫害和其它威胁。
Farmers use these substances to help crops grow, and to protect them from insects and other threats.
在冬季生长的农作物由于北方的气候只能收到一点点的UVB招生，并且温室中的植物还受到了玻璃墙进一步的保护。
Crops grown in the winter in northern climes receive very little UVB to begin with, and plants in greenhouses are further shielded from UVB by the glass walls.
传统的耕作方法将通过耕地来减少杂草的生长，但免耕农业选择使用除草剂来消灭杂草，以保护作物。
Conventional tillage controls weed growth by plowing and cultivating, but no-till farming selectively USES herbicides to kill weeds and the remains of the previous crop.
比较了平作和垄作下不同保护性耕作方式对土壤水分、温度和作物生长发育和产量的影响。
The influence of different conservation tillage systems under ridge plowing and flat breaking on soil moisture, temperature and crop growth and development and yield have been compared.
比较了平作和垄作下不同保护性耕作方式对土壤水分、温度和作物生长发育和产量的影响。
The influence of different conservation tillage systems under ridge plowing and flat breaking on soil moisture, temperature and crop growth and development and yield have been compared.
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