At present, the widely used citrus bagging cultivation techniques in major citrus producing areas have unique effects on improving the appearance of fruits, avoiding direct contact with pesticides, and producing green fruits. However, some growers despise post-bagging management techniques, so that the role of fruit bagging has not been maximized. According to the results of the study, the author proposed the "three increase three adjustments and three defenses" technology to ensure that the bagging fruit is of higher quality.
In general, bagging fruit has lower sugar content than bagless fruit, which is mainly because the microenvironment in the bag changes the normal growth and development of fruits. To this end, it is necessary to implement the "three increase" technology, that is, increase the amount of fertilizer, increase organic fertilizer, and increase phosphorus, potassium and calcium. Jiang Yongxiang grapefruit as an example, the total amount of fertilizer to be increased by 10% to 30%, during the fruit enlargement and more leaching rotting peanut dry 5 ~ 10 kg / strain + superphosphate 2 ~ 3 kg / strain + potassium sulfate 1 ~ 2 kg / Strain.
Sometimes, the main reason is that the inherent proportion of nutrients in pulp is imbalanced and the conversion progress is different. To this end, it is necessary to implement the “three-tone†technology, that is, to regulate the ventilation and light transmission of orchards, regulate the nutrient absorption of the trees, and regulate the physical and chemical properties of the soil. Such as Jiang Yongxiang grapefruit bagging, to strengthen the tree finishing, timely removal of summer shoots, reasonable control of autumn shoots, timely bag removal, improve the orchard ventilation, improve the photosynthesis of the tree, enhance the tree and fruit nutrition of the soil Elemental absorption capacity, promote photosynthetic products and minerals flow to the fruit; grapefruit spray 39% nitrate plant growth regulator 1000 ~ 2500 times, plus 25% ~ 35% homemade vinegar (adjust the PH value to 5.0 ~ 5.5), about 15 days/time, 2 times in a row; apply 1-30% lime water for 1 to 3 times or 50 to 100 kg lime for acre, adjust the acidic soil to PH 5 to 6, increase the nutrient supply capacity of the soil, increase The amount of calcium in the soil compensates for the lack of calcium absorbed by bagged fruits.
"Three defenses" means the prevention of pests, diseases, and cracking of fruit. The main insect pests after citrus bagging are fleas and ticks. The main diseases are foot rot and anthrax. The main physiological diseases are sun burning and fruit cracking. To this end, within 10 days after the end of the bagging, the entire garden spray once environmental pesticides and foliar fertilizers, such as 0.5% matrine nicotine water agent 500 to 1000 times liquid +16% copper rosinate 800 to 1000 times liquid + amino acid potassium calcium 500 to 1000 times liquid; 10 to 20 days later, random bags of investigation of pests and diseases, to achieve the prevention and control targets that bag solution spraying and re-bagging. About 50% of metalaxyl Mn zinc in 100 to 200 times or 10% of Bordeaux paste on the diseased tree, vertical lesions and healthy bark in about 1 cm of the circumference; K, Ca and Mg are sprayed continuously during fruit enlargement The mixture of trace element fertilizer and 2 to 3 times, 15 to 20 days 1 time, at the same time, the tree cover, timely and appropriate water irrigation drought, reduce cracking.
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