Cause Analysis and Preventive Measures of Shortage Seedlings after Maize Sowing
April 14 11:04:46, 2021
Maize seedlings, seedlings, seedlings and seedlings are the basis for high yields, but the phenomenon of lack of seedlings after sowing in corn production is relatively common. The main reasons are as follows: 1. Climatic factors 1. Low temperature and low temperature on corn Seed field emergence rate and germination potential have a certain degree of influence. In the case of an average temperature below 10°C, the seed germination power and germination rate are reduced, resulting in the reduction of field emergence rate. 2. Poor drought in dry soil, severe drought, and failure to timely watering are the main reasons for the low emergence rate in corn fields. Second, human factors 1, seed quality is poor, can not meet the state requirements of hybrid corn seed quality standards. The national standards are: Purity 96%, Clarity 98%, Germination 85%, Water 13%. 2. The quality of site preparation The crude soil preparation site is uneven, uneven, and varies in depth. The soil lumps are of different sizes or they are sown directly. After sowing of the corn, the seeds with less water in the soil and pressed by larger lumps are slow to emerge, and are difficult to emerge, thereby reducing the emergence rate. 3, seeding quality is not high sowing shades are different, and cover soil thickness is inconsistent. Seeds with deep sowing and thick soil have a slow emergence. Seeds with shallow soaking are easily washed by rain, and the sun can hardly germinate, which directly affects the emergence rate. 3, improper application of base fertilizer. The application of unfamiliar farmyard manure or direct contact with chemical fertilizers during seeding is prone to burning seedlings, resulting in lack of ponds. Third, rats, insects harm. Prevention and control measures: 1. Seed sowing of fine disease-resistance varieties whose seed quality meets the national seeding standards. 2, the soil temperature is stable above 12 °C sowing, can not water, must be sow after sowing. 3, intensive cultivation, leveling the land, sowing the land before sowing, the same depth, flat and fine, no large mass, uniform. 4, to improve the quality of sowing, sowing the same depth, to avoid overlying or too shallow overburden, cover soil should be uniform, when using chemical fertilizers as base fertilizer, do not directly contact with the seed. 5. The pesticides for the timely prevention and control of rodent pests and underground pests against subterranean pests include "enemy killing", "30% acephate EC", "extinction sweeping", "underground death", "covered tiger", "earthwinning" "", "Chlorpyrifos", etc., according to the instructions after the sowing date of 3 to 7 watered spray; or use "Pestworm" mix base fertilizer application. When the agent is added, a suitable amount of a plant growth regulator such as brassinolide is added to improve the quality of the seedlings and alleviate the diseases and phytotoxicity.