Navel orange flower volume, poor flower quality, serious drop and fruit drop. How to take care of the flowers and fruits is one of the important technical measures for obtaining high yield of navel oranges. First, timely pruning and wipe buds Spring navel orange buds should be promptly sparsely cut, cut off the top of the winter shoots, leggy branches, branches and branches of the disease, weak branches and crowns around the outer dense branches, cut off the leafless flowers, deformed flowers. Take a short cut over the long autumn shoots, leave 3-6 flowers, and leave it as weak as the method of “three to one, five to twoâ€. Cut tufted branches, wipe off the top of the canopy and the strong spring shoots on the outside of the canopy and dense short and weak spring shoots. Leave only 5-7 leaves on the Changchun shoots to pick up the heart or short cuts, completely erase the late spring shoots, summer shoots, and early autumn. Tip. Second, Baohuabaoguo sprayed 0.3% urea + 0.3% potassium dihydrogen phosphate + 0.2% borax (or boric acid) once during bud stage, Xiehua stage and young fruit stage. After 2/3 of the Xiehua and the first physiological fruit drop (the first half of May - mid-term), 50 ppm of "90%" + 0.3% of imported compound fertilizer was sprayed before the second physiological fruit drop (in early June) ( Only spray flowers and young fruit). In late May, the young fruit was coated with 250 ppm of “90%†+ 0.3% potassium dihydrogen phosphate + 0.3% urea. Third, anti-umbilical yellow fruit drop navel orange Xiehua 4/5, combined with preserved fruit spray 70% thiophanate-methyl 800 times +50 ppm of "90%." In late April and early May, the tree canopy was sprayed with 300 times amino acid compound fertilizer or sprayed with 800 times liquid foliar fertilizer such as Green Fenwei No. 2. In early June (after the second physiological fruit drop), the canopy was sprayed with 50 ppm of "90%" + 0.4% of imported compound fertilizer + 70% thiophanate-methyl 800 times. Or use 200-300 ppm of “90%†+ 70% thiophanate-methyl 800 times to smear the umbilicus and spray (or apply) once every 10-15 days. In late July to mid-August, the umbilical cord was coated with 600-800 times liquid "inhibitory yellow ester" to inhibit the occurrence of umbilical yellow. Fourth, the fruit cracking caused by cracking and fruit cracking The dry season should be timely irrigation and tree cover, cover grass thickness 10-15 cm. Before mulching, cultivating shallow loose soil around the tree tray and spraying 0.3% potassium dihydrogen phosphate in the young fruit period. From June to August, potassium fertilizer was applied 1-2 times in particular in the middle and early July. After the second physiological fruit drop, from June to the end of June, the 200-250 ppm "900" spot was used to coat the umbilical portion of young fruit. (For those who already have lightly cracked fruits, they can add 800 times 70% thiophanate-methyl in “90%â€), and spray 2-3 times of leaf fertilizer in the fruit expansion period from July to August. Use Green Fenway No. 1 800 times liquid; PBO 300-500 times liquid; or 0.3% potassium sulfate compound fertilizer; or spray with 0.3% urea + 0.2% potassium dihydrogen phosphate + 0.1% quicklime + 0.1% salt, effect Better.
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