Apple bagging management

After the bagging of apples, there are new features. The diseases and pests in the bags are not the focus of prevention. They should turn to protect the leaves, promote fruit enlargement, control the growth of new shoots, and regulate soil moisture. Specific management measures are as follows:

One, Paul leaves

After bagging, spray Bordeaux 3 to 4 times, once before and after the harvest, and spray 2 or 3 times before the end of September. The second is that in July and August, when the worm averaged 2 to 3 heads per leaf, it was sprayed once or once with avermectin plus carbendazim. The Bordeaux mixture must be prepared using a dilute copper dense ash method, ie, 10% water-soluble lime, 90%, dilute the copper sulfate with water, then slowly pour the dilute copper sulphate into concentrated lime water, and continue stirring to increase Bordeaux mixture. the quality of. When the rainfall is frequent, increase the amount of lime, spray Bordeaux mixture 1:2.5 ~ 3:200 to improve the ability to resist the erosion of rainwater. In this way, not only can the leaves be preserved, flower bud differentiation and fruit enlargement can be promoted, but also the number of sprayings can be reduced, and the cost and labor level can be reduced.

Second, top dressing

Top dressing is an effective measure to promote fruit enlargement. Time requirements for mid-maturing varieties in early July, late-maturing varieties of Fuji in late July and early August. Top dressing should be based on potash, supplemented with calcium fertilizer. Potassium fertilizers mainly include potassium dihydrogen phosphate and potassium sulfate: calcium fertilizers mainly include imported calcium nitrate and foliar calcium fertilizers. Late calcium supplementation is very important, according to the "Journal of fruit trees" Zhao Tongsheng et al. Determination of calcium absorption in young fruit is only 30%, accounting for 70% in the later period. The method of spreading water or spraying before rain is generally adopted so as not to damage the root system. The quantity used is, for example, the full fruit period, potassium dihydrogen phosphate or potassium sulfate 0.5 kg/strain, and calcium nitrate 0.25 kg/strain. Note that the fertigation on the market is generally high nitrogen fertilizer, easy to take after the use of strips, is not conducive to the formation of flower buds and fruit coloring.

Third, control the tip

The purpose of controlling autumn shoots is threefold: First, it prevents the top fruit from competing for calcium. The shoot's calcium content is 1/3 of the fruit. The rapid growth of new shoots and excessive new shoots will inevitably suck away a lot of calcium fertilizers, competing with the fruit for calcium fertilizer. The second is to control the growth of shoots and promote flowering. The growth of autumn shoots is controlled so that most of the short and middle shoots stop growing to facilitate the formation of flower buds. The third is to promote fruit enlargement. Through tipping and opening angle control measures, improve the transparency, increase the accumulation of photosynthetic products, and promote fruit enlargement.

There are five ways to control the fall shoot: First, spray the PBO fruit tree enhancer. The individual autumn shoots are sprayed once they begin to grow, and they are sprayed once every other month or so. The concentration is 200 times. Note that weak trees cannot spray. The second is frivolity. After bagging, the nocturnal flowering coefficient should reach 20% at the noon, and the dense shoots should be removed. Usually, they should be kept every 25 centimeters. The third is topping. For new shoots that have not stopped after more than 40 centimeters of bagging, about 1 cm should be removed at the top, and the number of heart-pickups should not exceed 20% of the medium-length shoots in order to prevent stripping. The fourth is the opening angle. For new shoots with a small space angle or 1-3 shoots, they can be led to places with space by pulling the branches open to ease growth and increase light. The fifth is twisting the tip. For new shoots with more than 40 centimeters in length on their backs, especially young trees, twist 180 degrees in the semi-lignified part, and the number of twisted shoots should not exceed 20% of the middle shoots.

IV. Water transfer

Under drought conditions, soil moisture is reduced, the solution concentration is increased, the roots cannot grow normally and nutrients are absorbed, and the fruit enlargement is inhibited, and bitter malaria and other deficiency traits can also be induced. In the case of excessive soil moisture in the rainy season, the death of the root system of anoxia also affects the absorption of nutrients, fruit enlargement and induced deficiency of the disease. It is generally required that the relative water content of the soil is always maintained at 80% (15 cm depth of soil soil is held in groups and broken down). It is better to use micro-spraying, straw mulching and other water saving and water conservation measures.

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