Some fruit growers once reported that the peach trees they planted each year in May and June have yellow leaves and fallen leaves. Some new leaves have just appeared white. In response to this phenomenon, local agricultural technicians are treated with iron deficiency in peach trees. However, the fruit growers reported that the leaves were also sprayed with iron fertilizer, and the ferrous sulfate was also applied under the trees, but it did not work. Why is this? We talked about the reasons for iron deficiency.
First, iron deficiency The peach iron deficiency is often related to the soil pH, dry humidity and the farmers' fertilizer habits. Therefore, iron supplementation should not be used to supplement iron, but the cause of iron deficiency in peach trees should be thoroughly understood. Solve the problem of peach iron deficiency.
One reason: Soil compaction, lack of oxygen in the roots. Most of the yellow peach leaves are peach orchards lacking cultivator. The soil is not loose, and the air permeability is poor. The roots of peach trees are severely deprived of oxygen, resulting in the inability of roots to inhale and causing iron deficiency.
Second reason: less water, soil drought. Although there was no serious drought in the area, it had been a long time since the rain had passed. The ground water evaporated and the salt was concentrated on the surface of the soil, which inhibited the absorption of iron by the peach tree.
Reason 3: Saline is too high. Alkaline soils are prone to iron deficiency. Limestone soils, in particular, are more likely to cause acid-base imbalances and iron deficiency symptoms.
Reason four: Improper fertilization. Normal use of carbon and ammonia, too much phosphorus, nitrogen and phosphorus too rich, a long time will also affect the peach inhalation of iron.
Iron catalyzes the synthesis of chlorophyll, and iron is one of the constituents of respiratory enzymes. When chlorophyll synthesis is inhibited when peach is iron-deficient, it will show chlorosis, yellow leaves, and even whitening.
Second, prevention and control measures
One is to improve the soil when topdressing peach trees, and then apply 2 kg of Shen Chong which is produced by the new Chaoyang of Chengdu per mu, and pour enough water after topdressing. Normally, when topdressing peach trees, organic manure or no-tillage fertilizer should be added appropriately to increase soil organic matter content, change the physical and chemical properties of soil, and release fixed iron.
The second is water irrigation and alkali reduction to once-irrigation water on fruit trees to promote salt-alkali settlement and pH adjustment.
The third is artificial iron supplementation. Each fruit tree chelating iron 40 grams + 50 grams of blue Jian (micronutrients), against the 20-30 kg of water at the crown edge drip irrigation, the effect is significant; also available 0.3% -0.4% sulfuric acid Ferrous solution or 0.1% to 0.2% chelated iron solution + 4000 times liquid Shuofeng 481, the foliar spray, spraying once every 5-7 days, continuous spray 2-3 times.
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