The recent cooling and rainfall have a good way to quickly replenish calcium fertilizer at low cost
1. The effect of calcium on vegetables and fruits
1. Calcium participates in the production of cell wall and promotes cell division. Therefore, the locations where the root tip, growth point, young fruit and other active cell divisions require relatively more calcium. If calcium is lacking, the most direct manifestation is the necrosis of the growth point and the root tip. Withered and died.
2. Calcium is the activator of some enzymes in plants, which has a certain influence on the metabolism of nitrogen and carbohydrates. Calcium has the function of eliminating certain organic acids in plants and reducing the toxicity of organic acids to plants; calcium also Conducive to promoting the absorption of potassium ions by plants.
3. Calcium forms a middle glue layer in the form of calcium pectate in the cell wall, just like the steel skeleton of a house, and the cell is the house. Calcium not only enhances the strength between cells and cells, but also enhances the strength of each cell. strength.
4. Calcium can participate in biological regulation activities, inhibit the production of ethylene, delay senescence, and improve fruit quality.
Two, calcium supplement method
1. Apply calcium fertilizer to the soil
There are many types of soil-applied calcium fertilizers, such as superphosphate, gypsum, calcium magnesium phosphate, and oyster shell powder.
2. Foliar calcium supplement
For foliar calcium supplementation, attention should be paid to the selection of varieties that absorb *********, and the reasonable fertilization period should also be paid attention to. The demand for calcium during the fruit setting period of crops is very large, which is the most critical period for calcium supplementation. Therefore, the spraying of calcium fertilizer must start from the young fruit stage and spray it continuously for 3 to 5 times. Because the mobility of calcium in plants is very poor, it is necessary to pay attention to the spraying of calcium fertilizer on the fruit.
High-quality calcium supplements should have two characteristics:
First, the calcium ion concentration should be high, which is required to be above 10%;
The second is that the calcium activity should be strong, and the absorption rate should be above 80%.
3. Calcium supplement period
Fruits have two peak periods of calcium absorption, one is within 50 days after flowering, more than 80% of the calcium required by the fruit has entered the young fruit, calcium should be supplemented 3 to 4 times with an interval of 7 to 10 days; the other is fruit harvesting In the first 30-40 days, supplement calcium 1-2 times. Therefore, it is necessary to focus on calcium supplementation during these two periods. It should be reminded that when supplementing calcium, you should spray the calcium solution on the fruit and the back of the leaf as much as possible.
Apple calcium supplementation: One is that more than 80% of the calcium required by the fruit has entered the young fruit within 50 days after flowering, and calcium should be supplemented 3 to 4 times, 7 to 10 days apart; the other is 30 to 40 days before the fruit is harvested , Calcium supplement 1~2 times. Therefore, it is necessary to focus on calcium supplementation in two periods.
Peach tree calcium supplementation: First, 2~5 weeks after flowering, meet the demand for calcium in hard-core stage, leaves and young fruit not less than 3 times; Second, 1 week before peach fruit expansion, the peel should be supplemented with calcium to increase hardness, 2 times Appropriate.
Grape calcium supplement: 1 time before flowering, 1 to 2 times in the young fruit stage after flowering (before closing the ears), and once in the picking period 10 to 15 days;
Tomato calcium supplementation: The best time to supplement calcium is during the period of tomato fruit swelling and maturity. Generally, it is used once every 7 to 10 days for 2 to 3 times in a row.
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