3.Most farmers alternate their crops.
4.Crop rotation helps prevent soil erosion.
5.Site Experimental Study on Grain-Grass Rotation in Song-Nen River Plain
6.select the right crops and rotate them rationally
7.A rotation of personnel; crop rotation.
8.Farmers rotate their crops so that the soil will remain fertile.
9.STUDY ON THE GRAIN CROP-COTTON ROTATION SYSTEM IN COASTAL COTTON AREA OF JIANGSU PROVINCE
10.The Research on Optimal NPK Dosage in Soybean-Corn Rotation System