"One year's plan is in the spring." At present, the spring season is spring season in Guangzhou. However, there are still cold air intrusions in spring, and the temperature fluctuations are large. Low temperature and rainy weather threaten spring sowing spring species. In order to avoid the influence of adverse weather, we must strive for the initiative of spring farming. The following tasks must be done: 1. Choosing the right spring planting season According to the spring climate change characteristics of this province and Guangzhou city, in the early rice planting, most of Guangdong, South, and Guangzhou cities are striving to complete the early rice planting task in early March. The use of Nylon film covering insulation in the northern mountainous areas of Guangdong Province began early rice sowing and breeding in early March. It was broadcast in mid-March, and strived to complete the sowing task before the “Guyu” solar season. In the spring crops, dry land crops, Guangdong and South China and Guangzhou in March. In the first half of the year, efforts will be made to complete the spring planting of dryland crops. In the northern mountainous areas of northern Guangdong, more cold-tolerant dryland crops will be planted in the early March. In mid-March, dry land crops will be sown in large quantities. The spring planting of dryland crops should be completed at the latest in late March. 2. Choosing the right time for timely planting of early rice sowing seedlings require stable adoption, and the average daily temperature is 12 degrees. Therefore, in the above-mentioned sowing period, according to the weather and climate changes, grasp the cold soaking warm technology, namely: “cold soaking, cold setting Germination, warming up, broadcast, strengthen management "16 words. Generally, dry land crops in spring are planted when the average daily temperature is 10-13 degrees and the extreme temperature is higher than 7 degrees. After sowing, the daily average is higher than 15 degrees, and 5 to 6 sunny days in a row can normally grow. Therefore, the spring crops of dry land crops must seize the "cold tail warmer" to sow the sunny warm weather. 3. Vigorously promote the mulching of nylon membranes The mulching of nylon membranes has the characteristics of air permeability, heat preservation, and moisture retention. It provides good microclimate environmental conditions for the rapid emergence and growth of spring sowing spring crops, but the cultivation of nylon membrane mulching films is also a matter of day management. After sowing, if there is low temperature and rainy weather, seal and heat protection seedlings shall be prepared; when the weather turns to sunny weather after low temperature and rain, early rice seedlings will be filled and watered and ventilated, so as to appropriately reduce the temperature of the field and increase the temperature of the field at night, until the weather stabilizes. After gradually draining the water, the water should be drained; on the same day when the temperature is low and rain is clear, the spring sowing of dry land crops should be filled with “running horse water”. During the day, it should be ventilated to ease the dramatic changes between day and night. After the weather stabilizes, the wet state of the surface is maintained. 4. Spring sowing of dryland crops should be done to prevent the crops from picking up water and dry land. The dry crops should not be exposed to the characteristics of dampness. For example, in the event of continuous low temperature and rainy weather in spring, excessive soil moisture will cause the imbalance of water and gas in the soil, and the root activity will be poor. Fertilizer capacity, aerobic respiration and soil oxidation process are weakened, soil organic matter is not completely decomposed, and toxic substances are easily accumulated, so that the supply of nutrients to the plants is insufficient, and the plants are poisoned, and lightly affects the growth and development of the crops. Dead seedlings, therefore, the spring sowing of spring crops should be dug in the drainage ditch, in the case of low temperature and rainy weather, the field should be drained to prevent surface waterlogging.