Health control agents are the core of super-high yield cultivation techniques. In order to achieve the best results, farmers should pay attention to the following points when using them. First, application time: In the late maize cornea, the penultimate third leaf grows, there are 2 leaves and tassels do not grow, the penultimate fifth or fourth leaf stem section has not been jointed, spraying best effect. Heilongjiang is generally in mid-July (about 1.5 meters in height of early-maturing cultivars, and about 1.8 meters in mid-late-maturing cultivars) from the penultimate lobe to the 2 to 3 days before the advent of the tassels, with 5 days of spraying time in the middle. Spray operations to avoid missing the best time. If you are concerned about the factors such as multiple reasons and rain, you can not spray pesticides in time, and you can spray them after the fourth last leaf grows. In this case, it is necessary to visit the fields frequently, select a representative plant, check a few leaves and grow, and then roughly calculate the spraying time; if the maize emergence is not uniform, the spraying time should be mostly Whichever comes out, the spraying will generally not affect the yield. Second, the amount: Heilongjiang, the first and the second plot of temperate planting corn is a late-maturing varieties, growing tall, if the fertilizer, water sufficient or dry years can be watered without drought, acres (667?) Application amount of 50 ml (Harbin, The late-maturing varieties in the Suihua and Sanchai areas have a dose of 50-55 ml), and the amount of mu in the dry year is 40 ml. In the mountainous areas and hilly lands in the three, four, five and six accumulated temperature zones in Heilongjiang Province, the soil fertility is low, and the species is also the early maturing variety. In the case of continuous drought, the amount of mu is 35 ml; if it is not dry, the amount of mu in the middle and early maturing varieties is 40. Ml. The amount of water, the human back electric sprayer watered 30 to 40 pounds, large and medium-sized machine cited sprayer watered 15 to 30 pounds, aircraft diverted water 2.5 pounds. Third, pay attention: 1. Strictly control the spraying time and dosage, when the corn ear and tassel have been grown, prohibit spraying, encounter continuous drought, poor corn growth should be appropriately reduced, so as not to produce phytotoxicity; Within 3 hours after spraying, it is necessary to make up 30% to 40% of the amount of sprayed acres to prevent re-spraying or missing sprays. 3. Intermitting corn and other crops should avoid spraying on other crops; 4. Acid killing Insecticides are used to control corn borers and aphids, but personal protection is needed to prevent poisoning. 5. Because the nutrients are mainly supplied to the roots for growth in the first few days after spraying the control agent, the tassels of the maize are extracted relatively late for several days.
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