Special weakly-alkaline fertilizer for citrus, and preparation method thereof

Abstract

The invention discloses a special weakly-alkaline fertilizer for citrus. The special weakly-alkaline fertilizer comprises urea, potassium phosphite, potassium chloride, potassium sulfate, zeolite powder, a calcium magnesium phosphate fertilizer, zinc sulfate, a boron-magnesium fertilizer, a humic acid composite fertilizer and a pest-resistant organic fertilizer, wherein the pest-resistant organicfertilizer is prepared by aerobic fermentation and decomposition of rapeseed meal, traditional Chinese medicine residues and brassinolide extract residues according to a mass ratio of (3-4):(1-2):(1-2) at 55-65 DEG C. The special weakly-alkaline fertilizer for citrus is an organic-inorganic combined fertilizer specially used for citrus, adopts a specific ratio of inorganic nutrients, and accords with the rule of the requirement of the citrus for nutrients in the whole growth period; and organic components in the fertilizer can effectively promote formation of a soil aggregate structure in order to improve soil fertilized with chemical fertilizer for a long time and improve the air permeability, water retention and fertilizer retention capacity of the soil, and inorganic nutrients are scientifically proportioned to guarantee the nutrient requirement law of citrus in the annual growth period in order to achieve the effects of increasing both production and income.

Description

technical field [0001] The invention belongs to the field of fertilizers, and in particular relates to a special weak alkaline citrus fertilizer and a preparation method thereof. Background technique [0002] Citrus (Citrus reticulata Blanco), also known as citrus, tangerine, tangerine, yellow tangerine, red tangerine, Dahongpao, etc., refers to tangerine, tangerine, pomelo, orange, etc. with a cultivation history of more than 4,000 years. Climate, cold resistance is slightly stronger than pomelo, lime, and sweet orange. The Rutaceae citrus subfamily is distributed between 16° and 37° north latitude. It is a tropical and subtropical evergreen fruit tree (except Hovenia trifoliata), native to my country’s Yunnan, Guangxi, and Guangdong regions, and is now cultivated all over the world. [0003] Citrus is an evergreen fruit tree, which shoots out many times a year, has a long growth period, produces a large amount of fruit, and requires a large amount of fertilizer. The total...

AI Technical Summary

Problems solved by technology

But at present, the site conditions of citrus orchards in my country are poor, the soil acidification is serious, and the soil is barren. The main reason is that a large amount of acidic chemical fertilizers or high-concentration nitrogen, phosphorus, and potassium ternary compound fertilizers are applied in large quantities, while the input of medium and trace elements such as calcium and magnesium is relatively insufficient. , causing soil nutrient imbalance, so that the basic elements such as calcium and magnesium in the soil colloidal particles are easily replaced by hydrogen ions, so that the pH value drops rapidly; single application of acidic fertilizers, after the ammonium is absorbed, the remaining acid roots and the soil Hydrogen ions combine to form acid, which will cause soil compaction, increase acidity, and destroy soil structure; phosphoric acid released from soluble phosphate fertilizers (such as monoammonium phosphate) can locally acidify the fertilization area

However, soil acidification has many hazards, which can aggravate soil compaction, make it difficult for plant roots to stretch, weak rooting power, difficulty in slowing down seedlings, and easy formation of old stiff seedlings.

Poor development of plant roots leads to reduced root absorption function, weak growth and reduced yield

The loss of fertilizer is serious, and the absorption and utilization rate of most of the medium and trace elements is very low. Even if a large amount of chemical fertilizers are used, the crops still grow slowly, with many diseases, low yield and poor quality, resulting in increased investment and greatly reduced benefits.

Phosphorus deficiency after phosphorus application and potassium deficiency after potassium application are obvious manifestations of low utilization rate after soil acidification

Soil acidification not only affects the availability of macroelements, but also affects the availability of trace elements, such as boron in the pH range of 4.7-6.7, and molybdenum in the pH range of 4-8. decreased sex

When pH<5, there are more active iron and aluminum, and phosphate radicals are easy to combine with iron and aluminum to form insoluble precipitates, which will lead to aggravation of soil acidification for phosphorus fixation, poor plant growth, weak stress resistance, easy to be eroded by pathogens, and soil structure. Destruction, soil compaction, physical deterioration, and decline in stress resistance

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