Citrus fruits are prone to cracking in the months from July to September before they are harvested. The main reason is that fruit development enlarges and gradually enters mature stage, and the skin stops growing or thickening, while the fruit juice inside the fruit quickly expands and increases, and the pressure of the exocarp rapidly thins. If the mature period continues to suffer severe drought and water shortages, it will be accompanied by heavy rain or continuous rain. The juice cells will absorb too much water, the orange petals will grow too fast, and the peel will not be able to withstand tremendous pressure, resulting in cracking. In addition, cracking is also related to cultivation techniques. If there is poor ventilation in the Orange Park, the groundwater level is too high, the soil is heavily watered, and the amount of nitrogen fertilizer is too much, if there are too many fruit set, the peel will become fragile and cracking will occur. Fruit cracking is also related to the variety, navel orange easily cracked fruit, late-maturing Wenzhou oranges, red orange or glutinous rice, glutinous rice, glutinous rice, glutinous rice, glutinous rice, glutinous rice胧??/P>
Keep the soil moist. Into the high temperature period can loosen the tree plate soil, and then apply fertilizer, and then use weeds, green manure or other weeds to cover the tree plate, help to maintain water and soil and reduce nutrient loss. In July-September, if continuous drought lasts for more than 7-10 days, it should be immediately irrigated with moisturizing and anti-cracking fruit. The amount of irrigation should be about one ton of water per mu, and the amount of irrigation should be about one ton per mu. The spray irrigation effect is the best, followed by irrigation, furrow irrigation, etc. .
Adjust tree nutrients. Less application of phosphate fertilizer, increased potassium fertilizer, nitrogen fertilizer and farmyard fertilizer can reduce cracking. From July to early August, dig 30-40 cm deep on both sides of the crown of the result tree, apply 30 kg of human excreta, 0.2 kg of urea, 0.2 kg of potassium oxide, and use 3-5 kg ​​of plant ash instead of potash; After 4 pm every day, spray 0.3% potassium sulfate or potassium dihydrogen phosphate solution once a week.
Chemical control cracking fruit. With a concentration of 30 parts per million naphthalene acetic acid plus a concentration of 10 parts per million of kinetin mixture, spraying in the fruit expansion period can reduce the occurrence of cracking. During the dry period, 0.3% urea or 30 parts per million gibberellin was sprayed on the canopy in the evening to spread the fruit parts once a week for 3 times; it can also be used in drought-free conditions. Concentrations of 20 parts per million gibberellin coated fruit have better anti-cracking effect. Or in the month before the citrus harvest, spraying 0.3% potassium sulfate and 1% calcium oxide solution on the leaves, has a clear effect on reducing cracking fruit, while increasing fruit sweetness and reducing acidity.
Root dressing outside. During the fruit enlargement period, spraying 0.4%-0.5% urea or 0.3% potassium dihydrogen phosphate, or 0.1%-0.15% aqueous solution of lufenfen for a long period of drought and rain, to stimulate the growth of the peel and make the peel and pulp Keeping the same growth can prevent cracking at high temperatures. When spraying, the middle and lower parts of the orange tree should be reused, sprayed once every 7-10 days, and sprayed 3-5 times. Or use 150 grams of urea, 100 grams of potassium nitride, 100 grams of vinegar, 100 grams of lime, 50 kilograms of water spray, there are anti-crack effect.
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