First, urea solution: A commonly used concentration is 0.5% to 1%, which requires 0.5 to 1 kg of urea dissolved in 100 kg of clean water. However, if the urea contains more than 1.5% diamine, it is toxic and should not be used as a foliar fertilizer.
Second, urine washing mixture solution: This solution provides nitrogen and helps eliminate pests. To prepare it, dissolve 0.5 to 1 kg of urea in 100 kg of water, then add 70 to 100 grams of detergent. Use it for spraying, and avoid leaving it mixed for too long.
Third, superphosphate leaching solution: It supplies phosphorus and also helps control pests on cotton plants. Take 2 to 3 kg of high-quality powdered superphosphate, mix with 100 kg of water, stir well, let it sit for 24 hours, filter, and use the filtrate for foliar spraying.
Fourth, potassium dihydrogen phosphate solution: Mix 300 grams of potassium dihydrogen phosphate with 100 kg of water for effective foliar application.
Fifth, NPK mixed solution: Prepare 100 kg of calcium superphosphate leachate at a concentration of 2% to 3%, then add 0.3 to 0.5 kg of urea and 1 to 1.5 kg of potassium sulfate for a balanced nutrient mix.
Sixth, potassium sulfate solution: The standard concentration is 1% to 1.5%, so add 1 to 1.5 kg of potassium sulfate to 100 kg of water.
Seventh, plant ash leaching solution: Use 5 to 7 kg of fresh, rain-free grass ash mixed with 100 kg of clean water. Let it steep for 14 hours, then take the clear liquid for foliar spraying.
Eighth, zinc sulfate solution: Dissolve 100 to 200 grams of zinc sulfate in 100 kg of water. Adding a small amount of lime water can enhance its effectiveness when applied as a foliar spray.
Ninth, borax solution: Mix 200 to 300 grams of borax with 100 kg of water. Since borax dissolves slowly in cold water, first dissolve it in 4 to 5 kg of warm water (around 45°C), then top up with 95 to 96 kg of water.
Tenth, copper sulfate solution: Add 30 to 50 grams of copper sulfate to 100 kg of clean water. To prevent toxicity, a small amount of lime water should be added.
Eleventh, ferrous sulfate solution: Mix 200 to 300 grams of ferrous sulfate with 100 kg of water. Iron fertilizers are not easily absorbed by leaves, so apply multiple times and ensure even, fine spraying on both sides of the leaves. Adding 50 to 70 grams of detergent powder can improve absorption.
Twelfth, manganese sulfate solution: Dissolve 50 to 100 grams of manganese sulfate in 100 kg of water for foliar application.
Thirteenth, ammonium molybdate solution: Mix 50 to 100 grams of ammonium molybdate with 100 kg of water for foliar spraying.
Fourteenth, biogas liquid diluent: Biogas slurry is rich in nitrogen and is quickly absorbed by leaves. Mix 10 kg of biogas slurry with 100 kg of water and use it immediately to avoid nitrogen loss.
Fifteenth, rare earth fertilizer solution: This is ideal for foliar spraying, as it increases chlorophyll content and enhances photosynthesis. For crops and fruit trees, use a concentration of 0.08% to 0.10%. Add 80 to 100 ml of rare earth microelement fertilizer to 100 kg of clean water for best results.
These solutions are practical and easy to prepare, making them excellent options for home or small-scale farming. Always follow the correct ratios and safety precautions when applying any foliar fertilizer.
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