Detailed Explanation of Key Points of Formula Fertilization Technology for Yardlong Beans
1. Symptoms mainly affect leaves, stems and vines, and pods. In the early stage of the disease, purple-brown spots appear on both sides of the leaves, and after expanding they become nearly circular dark brown lesions, 1-2 cm in diameter, with indistinct edges; when humid, the lesion surface is densely covered with sooty mold (especially prominent on the underside of the leaves). In severe cases, it causes early defoliation, leaving only the young leaves at the top, ...
1 Fertilizer requirement characteristics: Producing 1000 kg of yardlong beans requires 10.2 kg of pure nitrogen, 4.4 kg of phosphorus pentoxide, and 9.7 kg of potassium oxide.2 Key fertilization points for a yield of 2000 kg per mu:
2.1 Base fertilizer. Before planting, apply 3000 kg of organic fertilizer per mu and 40 kg of 45% "Sakefu" potassium sulfate-type three-element compound fertilizer.
2.2 Foliar fertilizer. At the bud stage, spray once on the leaves with 1.8% sodium nitrophenolate aqueous solution at 6000 times dilution or 1.2% sodium nitrophenolate aqueous solution at 4500 times dilution, and at an interval of 10 days spray "Sakefu" foliar fertilizer 1-2 times.