When to apply magnesium fertilizer to pomelo, and how to fertilize pomelo in different growth period

After flowering, 5 ppm2, 4 d, magnesium sulfate and 300 ppm anti-fall hormone were sprayed once.

1. Reapply pomelo base fertilizer:

More than 90% of pomelo is planted in hilly and mountainous areas, therefore, the vast majority of orchard soil is red soil, red soil is high acidity, most of the pH value is between, orchard soil is strong acidity, and the organic matter content is low, so before and after the beginning of winter solstice (November), combined with soil improvement and hole expansion, re-application of fruit fertilizer, in order to restore tree potential as soon as possible, promote flower bud differentiation, and accumulate nutrients for the second year's fruit. When expanding the hole, each plant is applied 8 15 kg of bio-organic fertilizer, phosphate fertilizer and an appropriate amount of nitrogen fertilizer, according to the actual situation of the growth of the tree, potassium dihydrogen phosphate can be used at the same time for extra-root topdressing, and spray boric acid once, in order to facilitate flower bud differentiation.

Second, pomelo strong shoot fat:

Pomelo strong shoot fertilizer in 2 3 months to apply a quick fertilizer, each plant apply urea, phosphate fertilizer each catty, borax 1 2 taels, after the spring shoot germination, at the same time available phosphorus dihydrogen potassium, urea for root topdressing (spraying), in order to promote the development of robust branches and flowers. In early and mid-March, urea and potassium dihydrogen phosphate can be used respectively.

3. Pomelo stable fruit fertilizer:

In April and May, fertilizer can be applied according to the growth of pomelo as appropriate, each plant was topdressed with compound fertilizer 1 catty, after mid-April, potassium dihydrogen phosphate was used for topdressing, and after flowering, 5ppm2, 4 d, magnesium sulfate and 300ppm anti-fall hormone were sprayed once. In case of dry weather, the fruit trees should be irrigated in time to prevent the occurrence of pomelo cracking.

Fourth, pomelo fruit fertilizer:

In July and August, the pomelo fruit expands rapidly, and the fertilization should be mainly organic fertilizer and fast-acting fertilizer. Each plant is applied 2 4 kg of biological organic fertilizer, compound fertilizer, and half a kg of urea is applied to old and weak fruit trees. According to the tree potential, the number of fruits is more and the amount of fertilizer is increased as appropriate.

When fertilizing, the method of opening the ditch is generally used, with the crown drip line as the midpoint, the ditch is long and the width is meters, each plant opens the ditch 8 10, covers the soil after fertilization, and the position should be changed every time the ditch is opened.

The leaves of pomelo are large, the fruit is large, the demand for calcium and magnesium is greater than that of other citrus fruit trees, and now the main planting areas of pomelo such as Zhangzhou area of yellow trees, dead trees are serious, mainly caused by nutritional imbalance, usually only apply nitrogen, phosphorus and potassium fertilizers, calcium, magnesium, boron, zinc, iron and other trace elements are relatively neglected. Through the experience of fruit farmers, it has been confirmed that in the spring shoot-flowering period and the flowering-fruit setting stage, micro-supplementing root force calcium + micro-supplementing punching magnesium can be applied to promote root strengthening, protect trees, and reduce tree failure; During the fruit expansion period and fruit harvesting fertilizer, micro supplementation can be sprinkled to promote fruit expansion, promote the rapid recovery of tree potential, and reduce the problem of yellow leaves and leaf fall after harvest.

When fertilizing in different periods, we must pay attention to the power of fertilization, and we must fertilize according to the weather, and also fertilize according to the trend of growth. Pay attention to the state of fertilization, as well as the frequency of fertilization, but also pay attention to fertilization, try to pay attention to the amount of water to fertilize, but also pay attention to the amount of fertilizer.

It is necessary to fertilize according to the growth period, but also according to the growth rate and growth situation. It is necessary to pay attention to the protection of the dust buried in the pomelo during the equipment process, the frequency of the equipment, the time of fertilization, the temperature of fertilization, the change of soil, and the prevention of diseases.

You can use some urea, you can use some farm fertilizer, and the root shed is determined according to the specific growth situation, you need to pay attention to safety, and you need to choose the right time carefully.

Summary. Pomelo cultivation is widely distributed in China. It is planted in Guangdong, Hunan and other places.

Good pomelo is full of aroma, water, sweet and sour, fragrant, and rich in vitamin C, which is highly sought after and loved by fruit farmers and consumers. However, some fruit farmers grow pomelo, the flesh is rough, the moisture is insufficient, the size of the pomelo is obvious, uneven and other problems, pay attention to these fertilization methods, help you improve quality and increase yield.

The planting land of honey pomelo species pure skin plum is widely distributed in China. It is planted in Guangdong, Hunan and other places. Good pomelo is full of aroma, water, sweet and sour, fragrant, and rich in vitamin C, which is highly sought after and loved by fruit farmers and consumers.

However, some fruit farmers grow pomelo, the flesh is rough, the moisture is insufficient, the size of the pomelo is obvious, uneven and other problems are late, pay attention to these fertilization methods, hold the oak to help you improve the quality and increase the yield.

No. Try to wait until you finish fertilizing.

Pomelo can be used with fertilizer from the Woye series, and the effect is better when used together!

1. Reasonable combination of organic fertilizer and inorganic fertilizer.

Due to the large amount of organic fertilizer, the relative shortage of fertilizer sources, the high cost of transportation, and the use of more labor for fertilization, some fruit farmers reduce the amount of organic fertilizer at will in order to reduce costs, resulting in the lack of organic matter in some orange orchards, which has affected the growth and development of trees and fruit quality.

If the orchard is applied with chemical fertilizer for a long time, it will acidify the soil, reduce the ability of fertilizer retention and fertilizer, which is not conducive to improving and fertilizing the soil, and is not conducive to the sustainable development of the pomelo industry. Therefore, we should adhere to the rational combination of organic fertilizer and inorganic fertilizer, so as to improve the physical and chemical properties of soil, improve the ability of soil fertilizer retention and fertilizer supply, and improve nutrient utilization efficiency.

In order to increase soil organic matter, more livestock and poultry can be raised to make manure; use straw, weeds, leaves and other resources to pile up fertilizer; Promote orchard grass, planting green manure such as thistle, clover, beans and other green manure between the rows of fruit trees directly covered or returned to the field: the construction of biogas digesters in the fruit area to accumulate fertilizer and other ways to develop organic fertilizer sources, to ensure that the annual application of organic fertilizer is not less than 15kg.

2. Determine the appropriate period of fertilization based on various factors.

In order to save labor and trouble, some fruit farmers will move the base fertilizer to the spring and apply it together with the top dressing, commonly known as "a bombardment", the amount of fertilizer is larger, the part is deeper, and most of them are not mixed evenly, resulting in the "starvation" of the pomelo fruit tree, the fertilizer effect is moved back, and the temperature is low in winter and often suffers from frost damage, which is not conducive to the normal growth and development of fruit trees. Fertilizer should be applied in a timely, appropriate and scientific manner according to the soil fertility status and the nutrient requirements of each stage of pomelo growth and development.

The peak of nitrogen uptake by adult pomelo trees is in summer, accounting for 50-70% of the total nitrogen uptake in the year, the peak of phosphorus uptake is in August and October, and the peak of potassium uptake is in June-August. If the pomelo fertilization method is applied twice a year, the reasonable fertilization period should be: strong fruit fertilizer from late June to early July, mainly nitrogen fertilizer and potassium fertilizer

Overwintering fertilizer was applied from mid to late October to mid-November, mainly nitrogen fertilizer, phosphate fertilizer and organic fertilizer. And the key period of fertilization should be determined according to the type and nature of fertilizer, such as chemical fertilizer, summer fertilizer should be reapplied; With organic late-acting fertilizer as soil, attention should be paid to the application of overwintering fertilizer. In general, the focus should be on overwintering fertilizer.

3. Pay attention to fertilization methods and improve fertilizer utilization rate.

Some fruit farmers fertilize as they like, regardless of organic fertilizer and inorganic fertilizer, not too deep and too far, and the fertilizer is relatively scattered; That is, the application is too shallow and too close, and the fertilizer is too concentrated. It leads to fertilizer waste, and fertilizer damage occurs from time to time. The method of soil fertilization should be adapted to the distribution characteristics of the root system, the period of fertilization, the type of fertilizer, the nature of fertilizer, the amount of rainfall, and the soil texture.

The fertilization depth should be determined according to the root distribution depth, and the fertilization position should be in the vertical soil layer outside the canopy, and the fertilization depth should be gradually deepened with the deep ripening of the soil. As the canopy expands year by year, the fertilization position is gradually moved outward, and the fertilization hole should change the direction and position one by one. In order to induce the deep and wide development of the root system, expand the range of nutrient absorption, and enhance the stress resistance of the tree, the fertilizer can be applied to the root concentration area slightly deeper and slightly farther away by using the fertilization of the root system.

The reason for the fertilizer damage of the pomelo, if you want the pomelo to have no fertilizer damage, you must first use safe and hormone-free fertilizers, fertile leaf series fertilizers, drought and little rain, low soil water content, poor water absorption and fertility of the pomelo roots, and the circumcision of the pomelo to promote flowering also aggravates the lack of nutrients in the roots, and the root system is in a state of starvation.

Before the spring rains (late January), the growers began to bury high-concentration instant compound fertilizer (n:p:k=21:0:21), and the location of the fertilizer furrow was within the drip line of the canopy, and the fertilizer was in direct contact with the root system of pomelo after application.

In early February, it rained, and all the fertilizer applied dissolved and spread, and the root system began to absorb water and fertilizer due to the long drought and rain. However, due to the dissolution of high-concentration fertilizer, high osmotic salt is formed in the soil solution around the root system, and the osmotic pressure of the soil solution is higher than the osmotic pressure of the root cytoplasm. If the individual fertilization ditch is dug far away from the drip line of the canopy, the fertilizer damage is relatively light; When it rains, the symptoms of fertilizer damage are not obvious.

Correct fertilization method of pomelo.

1. Fertilizers that are not easy to be dissolved instantly (such as: ternary compound fertilizer, phosphate fertilizer) can be applied by hole or furrow. The fertilizer hole or furrow must be controlled outside the drip line of the canopy, and can be used with fertile leaf fertilizer and liquid fertilizer.

2. Instant fertilizers (such as urea, ammonium carbonate, potassium fertilizer, etc.) can be applied in an appropriate amount when the soil is moist on rainy days. The method of watering can be used to open a long ditch to water fertilizer, and cover the soil after watering; If the weather clears immediately after sowing on a rainy day, and the fertilizer is not completely dissolved, it is necessary to irrigate the fertilizer in the place.