Acomparisive trial of 12 new introduced carrot varieties was conducted under multiple cropping conditions.
对引进的12个胡萝卜新品种在复种条件下进行了品种比较试验。
Monoculture practices can incorporate multiple cropping systems by using rotations, borders, and cover crops.
单一做法，可以将复种轮作系统的使用，边界，覆盖作物。
During 1981-1987, the fixed position observation was conducted in different patterns of multiple cropping system of paddy fields.
1981年至1987年，对稻田不同多熟种植方式进行了定位观察。
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