Rape seedlings should pay attention to the following points: To prevent drought. After sowing, rape often meets drought. Therefore, the nursery should always be watered and kept moist. Before emergence, insist on watering sooner or later; if drought persists after emergence. When the leaves of the seedlings are wilting, they must be poured in a timely manner. Add 1 to 2 scoops of decomposed human excrement per replenishment. At the same time, when there is too much rain, drains should also be cleared, and wood ash should be sprinkled on the bed to reduce the temperature.
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. Generally, seedlings can be grown during the 3-leaf stage, and the 5-leaf stage can be seedlings, or they can be used for a one-time or fixed-seedling at the 3- to 4-leaf stage. 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 followed by decomposed human urine 1000 ~ 1500 kg or 3 ~ 4 kg of 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. Available 50% malathion solution emulsion 1500 ~ 2000 times, spray 50 ~ 70 kg per acre, and even spray 2 ~ 3 times. In addition, carbendazim and thiophanate-methyl should be sprayed once in the three-leaf stage and 6 to 7 days before transplanting to prevent the occurrence and spread of diseases such as downy mildew and sclerotinia.
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