1、Farmers use potassium dihydrogen phosphate, it is wrong to spray

Because potassium dihydrogen phosphate sinks to the bottom, the amount of water is large and the stirring is uneven, which not only causes waste, but also many farmers will misunderstand that potassium dihydrogen phosphate is fake.

2、Effects of Spraying KH2PO4 on Flag Leaf Physiological

To assess the effects of spraying potassium dihydrogen phosphate (KH2PO4) on the physiological traits in flag leaves and grain yield (GY) and quality under heat stress during the filling period, we conducted a two-year field experiment in the winter wheat growing seasons of 2020–2022.

3、Usage of Potassium Dihydrogen Phosphate (MKP)

Spraying time: Spray during the critical period or peak period of crop absorption of phosphorus and potassium for the best effect. Seedling stage: The concentration is 0.05%~0.1%, and can reach 0.2%~0.3% in the middle and late stages, and is sprayed on foliage.

4、Effect of Foliage Spray of Potassium Dihydrogen Phosphate

Various concentrations ofpotassium dihydrogen phosphate were studied for their effects on growth ofprocessing type potatoes when applied as foliage spray.The plant height,stem diameter,haulm dry weight,and starch,protein,dry matter and vitamin C contents of tubers were increased as increasing in potassium dihydrogen phosphate concentrations to ...

Correct use of potassium dihydrogen phosphate

1. Potassium dihydrogen phosphate can be used for seed soaking, root dipping, foliar spraying and topdressing. Due to its high price, it is not recommended to use as base fertilizer. 2. Potassium dihydrogen phosphate is generally sprayed on the leaves.

Use of potassium dihydrogen phosphate

When high concentration of potassium dihydrogen phosphate is used, it is necessary to avoid high temperature time. It is not recommended to use high concentration in high temperature season.

How often is potassium dihydrogen phosphate sprayed?

Potassium dihydrogen phosphate is often used for foliar spraying, usually once every 10-15 days. It is not recommended to spray several times in a row, too much spraying will thicken the leaves.

How should potassium dihydrogen phosphate be administered? Should it be

Potassium dihydrogen phosphate is a compound fertilizer that supplements phosphorus and potassium needed for crop growth. In the impression of farmers, fertilizers should be applied at the root, but for potassium dihydrogen phosphate, the majority are used for foliar spraying.

Effects of Spraying KH2PO4 on Flag Leaf Physiological

To assess the effects of spraying potassium dihydrogen phosphate (KH 2 PO 4) on the physiological traits in flag leaves and grain yield (GY) and quality under heat stress during the filling period, we conducted a two-year field experiment in the winter wheat growing seasons of 2020-2022.

Potassium dihydrogen phosphate is used in this way, and the fertilizer

Potassium dihydrogen phosphate was sprayed respectively in the shoot growth period, before flowering, flowering and late flowering and fruit expansion period, and the dosage was 80-100 grams and 50 kg of water.

Black soybeans (Vigna radiata), also known as black beans or dark soybeans, are an important leguminous crop. In agricultural production, rational fertilization is one of the key factors for improving yield and quality. Regarding fertilization practices for black soybeans, the following recommendations are provided:

I. Fertilization Principles

1. Balanced Application: Apply nitrogen (N), phosphorus (P), and potassium (K) in balanced proportions based on soil fertility and crop requirements.
2. Prioritize Organic Fertilizers: Use organic materials (e.g., farm manure, animal dung) as the primary nutrient source to provide comprehensive nourishment.
3. Supplement with Chemical Fertilizers: Apply chemical fertilizers judiciously, especially high-potassium formulations like potassium dihydrogen phosphate (KDP) to meet the crop’s potassium needs.
4. Micronutrient Supplementation: Add trace elements such as boron (B), molybdenum (Mo), and zinc (Zn) to promote growth and enhance yields.
5. Scientific Ratios: Adjust fertilization ratios and timing according to growth stages and objectives.
6. Eco-Friendly Practices: Use environmentally friendly fertilizers to minimize ecological impact.

II. Fertilization Methods

1. Base Fertilization: Apply before planting or at transplanting, using organic fertilizers and compound fertilizers. Incorporate base fertilizers deeply to ensure even distribution within the root zone.
2. Topdressing: Conduct multiple top-dressing applications based on plant growth and soil fertility. Methods include foliar spraying, drip irrigation, and hole application.
3. Foliar Spraying: During vigorous growth stages, spray high-potassium fertilizers (e.g., KDP) to promote leaf development and photosynthetic efficiency.
4. Drip Irrigation: Deliver fertilizers directly to roots via drip systems to improve absorption efficiency.
5. Hole Application: Bury fertilizers near the root zone to enhance nutrient uptake.
6. Late-Stage Foliar Spraying: Apply KDP during late growth stages to delay leaf senescence and boost yields.
7. Root-External Topdressing: Spray KDP onto leaves during late stages to improve nutrient absorption and productivity.

III. Key Considerations

1. Avoid Over-Fertilization: Excessive fertilizer use can lead to soil salinization, nutrient imbalance, and hinder crop growth.
2. Timing and Method:
   • Foliar spraying should occur in early morning or evening to avoid heat damage.
   • Drip irrigation is best performed on sunny days to reduce water loss.
3. Avoid Mixing with Pesticides: Some fertilizers may react chemically with pesticides, causing phytotoxicity or reducing efficacy.
4. Soil pH Management: Black soybeans thrive in soils with pH 6.5–7.5. Adjust acidic or alkaline soils accordingly.
5. Regular Soil Testing: Analyze soil nutrient levels to optimize fertilization plans.

IV. Practical Example

A farmer cultivated 5 mu (~0.33 hectares) of black soybeans, applying 200 kg of farm manure per mu as base fertilizer. During the flowering period, he sprayed a KDP solution (100 ml per plant) to promote fruit development. Additionally, he used drip irrigation to deliver KDP directly to the roots. Throughout the growth cycle, he adjusted fertilization ratios and methods based on soil tests and plant conditions. These scientific practices significantly improved both yield and quality.

Fertilization for black soybeans should be flexibly adjusted based on specific conditions, prioritizing balanced organic-inorganic combinations and mindful application timing. Proper fertilization management effectively enhances productivity and crop quality.