The boll opening period refers to the period from the start of boll opening to dry frost and the end of fertility. Generally, the boll opening starts from late August to early September and continues for 70-80 days. When cotton enters the boll opening stage, vegetative growth gradually declines, and reproductive growth dominates. Demand for water and nutrients is significantly reduced. It is not prone to leggy, but it is prone to premature aging. In order to ensure the normal birth of cotton plants in the north, it is necessary to strive for good development of autumn peaches. , still need to supply certain nutrients and moisture. In the management of boll opening period, general cotton fields should prevent premature senescence, and high-yielding cotton fields should prevent late ripening and promote early maturing. 1. Adhere to watering and fertilizer supplements. Only a small part of cotton bolls boiled during the early flocculation stage. Most bolls are being enriched, and some young bolls are growing at a larger volume. This is a critical period for adding bolls, increasing boll weight, and improving quality. If it is necessary to insist on watering in case of drought, it is advisable to use a small ditch for watering. Watering time should not be too late, so as not to cause late-growth greed. As shown in the defertilizer, 1% urea solution and 0.5% superphosphate solution can be sprayed. 2. Reasonable pruning, promote early maturation, prevent corruption Bell cotton field into the boll opening period still need to continue to do a good job of playing the old leaves, cut empty branches, playing around the heart and other pruning work. Especially for the late growing trend is relatively prosperous, the late cotton glutinous cotton field should be hurriedly carried out. In order to improve the ventilation and light transmission conditions, the organic nutrients will be concentrated to supply the settled cotton bolls so that they can mature and boll early, and the rotten bells can be reduced. 3, timely picking the old ripe peach if the early flocculation stage rainy, early in the cotton field will appear rotten bell, in order to reduce the loss, can be boll period more than 40 days of bolls removed in advance, with 0.5% -1% concentrated ethephon After the source liquid is sprayed or soaked, the normal bolling bell can be obtained. 4. Timely harvesting guarantees that quality bolls should be harvested 5-7 days after cracking. The time interval is too long. Under sunlight, fiber will be oxidized and become brittle, strength will be affected, and quality will be degraded. The flower harvest needs to be done: "five points", "four nets" and "two nos." "Five points" means that the different varieties are separated, leaving the seed and the general plant apart, and after the cream is split, the good flower and the branch flower are collected. Normal matured and stripped green peaches were harvested. "Four nets" is to collect the flowers on the cotton plants, pick up the pods inside the shells, pick up the nets on the ground, and remove the debris from the husks on the cotton husks. "Do not accept" that is not fully mature flowers do not rush to close. Dew on the batting temporarily can not be collected, each harvest can be strictly to achieve the above requirements, you can not only ensure high yield, but also improve the quality of cotton, in the above-mentioned process to prevent the "three wires" mixed.
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