1, the amount of fertilizer and application period

Due to differences in ecological environment, soil conditions, cultivation and management, fertilization amount and fertilization period also vary with different conditions, after modeling the differences in local soil nutrient levels and soil nutrient supply intensity and fertilizer utilization, Through soil excavation, the soil nutrient content was determined according to the calculation formula of balanced fertilization. In locations where these conditions are not available, soil temperature may be increased or decreased by referring to the following levels of fertilization for each crop, depending on the level of soil nutrients and tree vigor.

(1) Fertilization of young trees (aged 1-4)

1 Fertilization period: 10-15 days before the shoot shoots and one after the new shoot, the fertilization should be no less than 6-8 times a year. After September, the top dressing was stopped to prevent late autumn shoots. 2 The amount of fertilizer: With the increase of the age of the tree, the amount of fertilizer is increased year by year. Before the shoot is sprouted, the strain applies urea 0.1-0.2 kilograms or medium-to-high-density compound (mixed) fertilizer 0.1-0.2 kilograms and decomposed manure water or strain 20-30% bran cake water 5-10 kilograms. New shoots after cutting: the application of high concentration compound (mixed) fertilizer 0.1-0.15 kg.

(2) Fertilization of adult trees (over 5 years old)

1. Fertilization of the initial result tree

The results tree is mainly focused on fruit harvesting, pre-flowering and fruit-promoting fertilizers.

Harvesting fruit fertilizer: that is, fertilization after fruit picking from December to next January, for the spring shoot period, mainly organic fertilizer and other slow-acting fertilizers, supplemented by quick-effect fertilizer. General urea 0.15-0.3 kg per plant, high concentration of compound (mixed) fertilizer 0.1-0.3 kg, 10-20 kg farmyard fertilizer.

Fertilizer before flowering: fertilizer is applied before flowering in the first two months of the month, promoting the development of strong spring shoots and improving flower quality. General application of urea per plant 0.1-0.25 kg, high-concentration compound (mixed) fertilizer 0.1-0.3 kg, farmyard fertilizer 10-20 kg.

Strong fruit attack autumn shoot fertilizer: in mid-July, strong fruit promote shoot fertilizer, to promote the development of autumn shoots, shoots and strong fruit to increase fruit, fertilizer consumption accounts for about 50% of the year, for the second year of high yield production basis. Generally, each plant applies 0.2-0.3 kg of urea, 1-2 kg of bran cake, 0.5-1.0 kg of calcium, magnesium and phosphorus, and 0.25-0.3 kg of potassium sulfate.

2. Fertilization of the result tree in prime time

The results of the first year of the tree fertilization for 4-5 times a year, before and after fruit picking, before spring shoots and autumn shoots before the focus of fertilizer.

Harvesting fruit fertilizer: Late-maturing species, middle-mature species with more results and weaker result trees should be applied before fruit-picking, medium-maturing varieties with medium-maturity and moderate results should be applied after fruit-picking.诓 诓 笆 笆 晁 晁 晁 晁 晁 俚 俚 俚 ( ( ( ( ( ( ( ( ( ( ( ( ( 14 14 14 14 14 14 曰 曰 魇 魇 魇 魇 魇 魇 魇 魇 魇 魇 魇 魇 魇 魇 魇 R R R R 豆 . .. --1 kg, farmyard fertilizer 40-50 kg, 1-2 kg of bran cake. Acid soil added 0.5 kg of lime.

Fertilizer before flowering: 15 days before spring shoot germination to promote good growth of spring shoots. Generally, 0.3-0.5 kilograms of urea are applied to each plant, and 0.3-0.5 kilograms of compound (mixed) fertilizer with high concentration, and 2-3 kilograms of bio-organic fertilizer.

Steady fruit fertilizer: look at the tree and apply. Generally, 0.2-0.3 kilograms of urea per plant or 0.4-0.5 kilograms of compound (mixed) fertilizer with high concentration is applied.

Strong fruit-promoting shooter: Before and after the summer heat, it is applied 15 days before the shoots sprout to promote the growth of autumn shoots. Generally, each application of bran cake 2-3 kg, high-density compound (mixed) fertilizer: 0.5-0.6 kg, potassium sulfate 0.3-0.5 kg, calcium magnesium phosphate 0.5--1 kg.

2, fertilization method

The main ring groove and groove method. 1 Ring Groove Fertilization: Dig a ring or semi-annular groove on the outside of the canopy drip line, width and depth of 15-20cm, apply the fertilizer into the ditch and immediately cover the soil. 2. Trench fertilization: Each year rotates alternately on the outside of the canopy drips symmetrically digging two parallel strips, width and depth of 20-30cm, when the expansion of the hole to improve the soil when the trench is deeper than 60cm, the fertilizer is applied into the trench and immediately covered with soil.

3, foliar fertilizer

Citrus trees, in the flowering bud stage, spraying borax and urea mixture 1-2 times outside the root can improve the quality of flowers, increase the fruit setting rate from the surface; spraying 2-3 times of potassium dihydrogen phosphate during the flowering stage And urea mixture, can reduce physiological fruit drop, promote rapid growth of young fruit; after spraying fruit potassium dihydrogen phosphate solution, can better restore tree vigor, protect the green leaves for the winter, laying the foundation for the next year's high yield. Foliar fertilization should strictly control the use of concentration to prevent the resulting damage. Common use of foliar fertilizer concentration: urea 0.1-0.2%; potassium dihydrogen phosphate 0.1-0.2%; borax 0.1-0.2%; magnesium sulfate 0.3-0.5%, zinc sulfate 0.1-0.3%. One week after the spraying.

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