Rapeseed strong seedlings catch "four to
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To set seedlings in the morning. In order to prevent excessive seedling density, causing overcrowding, competing for sunlight, consuming large quantities of water and nutrients, and affecting the cultivation of strong seedlings, it is necessary to establish seedlings as early as possible. Usually in the three-leaf seedlings, five leaf stage Dingmiao, or at the 3-4 leaf stage for a one-time, Dingmiao can also be. When thinning, it is necessary to stay weak and strong, to stay small to stay large, to stay pure, to stay healthy. In addition, weeds should be removed from the seedlings at the same time to prevent grass shortage.
To top-dressing. After the emergence of the first true leaf flat, it should be topdressing. Generally, a low concentration of 1,500 kilograms of human and animal manure is applied per acre. One week before transplanting, per acre topped with urine 1000-1500 kg or 3-4 kg urea. In the middle, we must chase the fat once again. Seedlings such as normal growth, can not be applied; such as the leaves from green to yellow, slow growth, urea can be used per 0.25 kilograms of water 2 poured pouring.
To control pests and diseases. The main pests of rapeseed seedlings are root maggots, aphids, and cabbage caterpillars. These pests not only damage the leaves but also drill the roots and stems of the pods directly. The locusts can also transmit viruses and other diseases. 50% malathion sulfate emulsion can be sprayed 1500-2000 times, spraying 50-70 kilograms per acre, and spraying 2-3 times. In addition, it is best to spray carbendazim and thiophanate every third leaf stage and 6-7 days before transplanting to prevent the occurrence and spread of diseases such as downy mildew and sclerotia.