Why the growth of parsley seedlings is different

In a piece of coriander field in Beiguanzhuang Village, Luocheng Street, the growth of coriander seedlings between the north-south about 50-60 meters long beds is different. Among them, the northern 15-20 meters coriander plant is slightly shorter, and thin, and the lower leaves are yellow; while the southern half grows strong and the stems and leaves perform well, appearing very "spirited". According to Master Wang, the reason why coriander grows differently is all caused by continuous cropping. Coriander is afraid of continuous cropping, this vegetable farmer friends are clear, that is to say, planted coriander plot, as long as the next year to continue planting, coriander will appear serious death, poor growth and other symptoms, this is the so-called continuous cropping. Strangely, however, if one crop of cilantro is harvested and the next crop is planted immediately after, the impact of successive crops will be small. "I used to plant coriander at the north end of this land. I thought it had been five or six years since I first planted coriander. Moreover, if I didn't plant coriander, this small land would look even more fragmented, so I braced myself to plant coriander. I didn't expect that this 'ten year agreement'(planting coriander plots within ten years and then planting continuous crops to harm heavy) was still a matter. It doesn't seem to differ much now, but as the plant grows, the difference will become more and more obvious." Master Wang introduced. At this time, the reporter also pulled out a few coriander observed its root system, careful observation found that the coriander root system of the continuous cropping plot is weak, performance is short, and the coriander root system of the stubble field is thick, long, strong and powerful. Because it is said that vegetable farmers planting coriander in arch shed can reduce the harm of continuous cropping, so the reporter also suggested that Master Wang buy part of biological bacteria fertilizer to reduce the harm caused by continuous cropping and promote the high yield of coriander; in addition, during the planting process of coriander, attention should be paid to spraying part of foliar fertilizer to promote the growth of leaves, beautiful color, which can also improve the appearance and increase economic income.