Ảnh hưởng của bột vỏ trứng và phân kali đến sinh trưởng, năng suất và chất lượng giống dưa vàng Kim Hoàng Hậu được trồng trong nhà màng

Abstract

The research was conducted to determine the appropriate amount of eggshell powder and potassium fertilizer for Kim Hoang Hau melon variety grown in green houses in Thieu Hoa district, Thanh Hoa province. The experiment was designed completely randomly, with 3 replications. The treatments included levels of eggshell powder application (E0: no application, E1: 100 kg/ha, E2: 200 kg/ha, and E3: 300 kg/ha) combined with levels of potassium fertilizer application (K₂O) (K0: 130 kg K₂O/ha, K1: 140 kg K₂O/ha, K2: 150 kg K₂O/ha, K3: 160 kg K₂O/ha). The base amount of fertilizer for 1 ha included 15 tons of manure, 200 kg of lime powder, 40 kg of mixed micronutrients, 30 kg of MgSO₄, 130 kg of N, and 130 kg of P₂O₅. The research results showed that the cucumber plants, from planting to 42 days without additional potassium, were only affected by the eggshell powder. At the level of 300 kg/ha of eggshell powder, the cucumber plants had the earliest female flowering time of 21 days and quickly reached 28 leaves by the 42 days of topping. The formula of applying 200 kg/ha of eggshell powder and 150 kg of K₂O/ha resulted in no fruit cracking, thicker fruit skin, the highest yield of 35.5 tons/ha, a Brix level of 13.5%, and the highest net profit of 613.93 million VND. The formula without egg shell powder and without potassium supplementation had a high fruit cracking rate of 5% and a thin fruit peel thickness of 7.