Apple needs calcium supplements?
Calcium is known as the three major nutrients in the apple with nitrogen and potassium, and apple has a great demand for calcium. Studies have shown that the production of 1,000 kilograms of apples requires 2.5 kg of nitrogen, 0.4 kg of phosphorus, 3.2 kg of potassium, and 3.7 kg of calcium.
Calcium is absorbed and transported mainly by the plant's transpiration, and its mobility is poor. It can only move 4 to 5 centimeters per day within the tree. It is difficult for calcium fertilizer applied in the soil to meet the calcium requirement of fruits during vigorous fruit growth.
The foliar spraying of calcium is mostly concentrated in the pre-bagging young fruit period, but since most of the calcium fertilizers are sprayed on the fruit surface, they can be absorbed and utilized by the fruit. At this time, the fruit surface area is small and absorbed. The amount is extremely limited.
Therefore, calcium is supplemented by soil application and leaf spray before bagging, and the actual absorption of fruit is often insufficient.
Is the bagging period the second peak of calcium absorption?
The study found that apple 4 to 6 weeks after flowering is the peak period for calcium absorption in fruits, and the amount of calcium absorption can account for 70% to 92% of the total growth period.
In recent years, studies have found that compared with unspogged apple, bagged apples have two peak calcium absorption period, the first peak period is in the young fruit period, the calcium intake accounted for 42% of the total The second peak period is during the fruit enlargement period, which accounts for 58% of the total, among which the early-maturing varieties of Jura, Shan Xia, and Xin Hongxing have increased their calcium absorption by 30% within one month after rapid expansion. In the July and August, 42.5% of the calcium was absorbed. Within 10 days after the bag was taken, there was still a small amount of calcium accumulated in the fruit, which was significantly higher than that of the unbagged apple. Therefore, while maintaining calcium supplementation within 4 weeks after fruiting, fruit production should also emphasize calcium supplementation during fruit enlargement and maturation, especially late-maturing varieties such as Red Fuji.
Bagging can inhibit calcium absorption and accumulation?
Bagging changes the microclimate conditions such as temperature, humidity, light, etc., and thus affects the absorption of calcium during fruit growth and development.
After bagging, the humidity inside the bag is significantly higher than that outside the bag, and the transpiration is reduced. The calcium that flows into the fruit from the transpiration liquid is significantly reduced. Most of the calcium is transported to the organs where the transpiration is large, such as leaves, high temperature and strong light, and the bagging is premature. Or picking the bag too late will inhibit the accumulation of calcium in the fruit.
The study also found that calcium in fruits during the fruit enlargement period will also “reverse flowâ€, and calcium will flow from the fruit to the growing point to meet the needs of shoot growth and flower bud differentiation.
Continuous rainy days will inhibit the absorption of calcium in the root system. Excessive application of nitrogen fertilizer can easily cause new shoots to prosper and compete with fruit for nutrients. If the amount of calcium that the fruit flows back to the leaves is greater than the calcium absorbed by the fruit itself, the fruit will occur. Calcium deficiency physiological disease.
Studies have shown that the incidence of physiological diseases of calcium deficiency in bagged apples is 4 times higher than that of unbagged apples. Therefore, timely addition of calcium is a top priority.
Electric Eyebrow Remover,Electric Eyebrow Trimmer,Automatic Eyebrow Trimmer,Best Electric Eyebrow Trimmer
Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizon.com