What is there to pay attention to growing sunflowers?

What do you need to pay attention to growing sunflowers? There are ten points to pay attention to when planting sunflowers: first, rotation should be reasonable and stubble should be selected. Sunflower is not suitable for continuous cropping and planting in low-lying land prone to waterlogging, and the selection of previous crop is not strict. Except sugar beet and deep-root forage, other crops can be used as the first crop of sunflower. Sunflower has strong adaptability and is the most suitable for planting in sandy loam or loam soil with deep soil layer and high PH value of 6-8. Second, select excellent varieties and deal with them. Third, apply sufficient base fertilizer and tamp the foundation. Fourth, catch early before the robbery and broadcast early at the right time. Timely early sowing can prevent or reduce the occurrence of leaf spot and Sclerotinia sclerotiorum, and have a great impact on the yield and quality of sunflower. Fifth, reasonable close planting is beneficial to ventilation. Sunflower stalk tall, stem thick, should be reasonable close planting, conducive to ventilation and light transmission, improve photosynthesis. The principle is that tall stalk and large grain varieties should be sparse, dwarf and small grain varieties should be dense, oil type varieties should protect 25000-30000 seedlings per hectare, and edible varieties 18000-20000 plants per hectare. Sixth, strengthen ploughing and topdressing at the right time. Early thinning and early setting of seedlings, when the seedlings grow to two pairs of straight leaves, fix the seedlings; from emergence to bud stage, carry out 2-3 times of intermediate ploughing and weeding; the last time, deep ploughing and soil cultivation should be done to prevent toppling, but it should be noted that the roots should not be hurt. Topdressing should be both timely and reasonable. From budding to flowering, sunflowers should be topdressing 150 kg of urea per hectare, ditch or hole application, and spraying 0.2% 0.4% potassium dihydrogen phosphate at full flowering, depending on the growth, once or twice. 7. According to the growth trend, fork in time. During the period from budding to flowering, sunflower often bifurcates. Once found, the bifurcation is removed immediately to reduce the consumption of water and nutrients and ensure the nutrient and water needs of the main stem disk. Eighth, adjust measures to local conditions and irrigate scientifically. In the sunflower disk formation stage, flowering stage and filling stage, timely and appropriate amount of scientific irrigation, especially in case of drought, should be timely irrigation to meet the water needs of sunflower in the growth and development stage. Forecast, disease prevention and pest control. It is necessary to do a good job in the prediction and forecast of diseases and insect pests, and once they occur, we should immediately prevent and cure them, and strive to cure them as soon as possible. Assist in pollination to improve fruiting. Sunflower is a cross-pollinated crop, which is pollinated by insects and bees. in spite of this, artificial pollination should be carried out at about 10:00 every morning (9 am to 11:00), usually 2-3 times. More sunflower planting techniques