Strengthen the Management of Seedling Field and cultivate strong Rice seedlings

1. The seedling bed tube for raising seedlings with flood and drought does not need to replenish water at the seedling stage, so as to improve the drought tolerance of the seedlings. At the same time, attention should be paid to watering the seedlings three times, that is, pouring enough "soil moisture" before sowing, pouring "uncovering film water" when the film is uncovered, and "rolling leaf water" during drought. We should properly control water in the first and second leaf stage to promote seed root rooting, pay attention to replenishing water to prevent dead seedlings in the second and third leaf stage, strictly control water after the third leaf stage, and cultivate physiologically strong seedlings by dry cultivation. In order to prevent too many Rain Water, dry cultivation and drought management can not be carried out, small arch shed or greenhouse can be used to strictly control water and drought cultivation. The seedling raising of throwing rice adopts the moist irrigation method of full ditch water in sunny day, half ditch water in cloudy day and dry water in rainy day, and the water layer does not exceed the disk surface to prevent the root soil from being lifted up and form a string of roots. Wet raising seedlings fall to the stage of 1 leaf and 1 heart, leave water in the ditch, keep the seedling board moist, establish a water layer at the 3-leaf stage, and carry out regular irrigation in shallow water to promote tiller growth.

2. after strict fertilization, the seedling bed of dry-raised seedlings has sufficient fertilizer, complete nutrients and high content of available fertilizer. generally, it is not necessary to apply milk fertilizer, but only need to see the seedlings after the 3-leaf stage. Generally, 4kg of urea or 750kg of dung water is applied per mu, body fertilizer is applied 1-2 days before pulling seedlings, and 7kg of urea is applied per mu. Topdressing should be carried out in the evening, using the fertilization method of sprinkling first and then spraying water. For throwing rice seedlings, appropriate amount of topdressing should be applied, weaning fertilizer should be applied at one leaf and heart stage, urea 3-4 kg per mu, body fertilizer 2-3 days before throwing planting, and 5-6 kg urea per mu. The conventional wet seedling field should adhere to the fertilization principle of early application of weaning fertilizer, skillful application of relay fertilizer and re-application of body fertilizer. During the period of one leaf and one heart, 5kg urea per mu was applied for weaning fertilizer, 3kg urea per mu for relay fertilizer, 3kg urea per mu for relay fertilizer, 8kg urea per mu for 2-3 days before seedling pulling, and transplanting with fertilizer.

Third, the prevention and control of diseases and insect pests should be done well in the seedling stage, such as gray planthopper, stem borer and other diseases and insect pests. We should focus on the whole process of drug control from the migration of gray planthopper to the peak period of adult migration of gray planthopper, which can be controlled by propofol, Ruijin and other insecticides. and mixed with imidacloprid, chlorpyrifos, isoprocarb, dichlorvos and other quick-acting pesticides to prolong the control time and improve the control effect. The interval between the use of drugs and the times of control should be determined according to the amount of infected insects and the resistance of varieties in the seedling stage. For the seedling fields with high number of infected gray planthopper, long epidemic period of adults and susceptible varieties, it is necessary to shorten the interval between the use of drugs, implement the whole course of drug control, and improve the control effect of gray planthopper, and for the seedling fields with low amount of poisonous insects or varieties that are more resistant (resistant) to disease, it can prolong the interval period and reduce the frequency of drug use. Combined with the control of early gray planthopper in seedling field, the control effect of stripe blight was improved by adding virus passivator such as Shikeduke to the susceptible varieties in the re-occurrence area. In the reoccurrence areas of borers along the Yangtze River, southern Jiangsu and Huaibei, while controlling stripe blight of gray planthopper, attention should be paid to the control of diseases and insect pests such as the first generation of borer and rice thrips.