Abstract:

Through nutrient deficiency experiments and comparative experiments of different levels of fertilizer application, the absorption and utilization characteristics of N,P, K,Fe,Cu and Mn in cabbage Chunfeng 007 were studied, providing a basis for fertilizer reduction and efficiency increase and scientific fertilization in cabbage. The nutrient deficiency experiment found that when there is a high content of available phosphorus and available potassium in the soil, applying P₂O₅ or K₂O fertilizer again can not increase the yield of cabbage, but instead will reduce it; Applying N fertilizer can increase the yield of cabbage. From the perspective of different fertilization levels, the more fertilizer applied, the higher the yield of cabbage, but the magnitude of yield increase gradually decreases. When the target yield of cabbage was 66 277 kg·hm^-2, the application of N, P₂O₅, and K₂O was 216, 216, and 216 kg·hm^-2, respectively, to maintain nutrient balance in the soil during the season. It was suggested to adjust the fertilization ratio for cabbage and reduce the amount of phosphorus and potassium fertilizers appropriately. The absorption ratio of N, P₂O₅, and K₂O should be 22.28∶10.00∶31.04. In this experiment, the maximum absorption of Fe,Cu, and Mn elements of cabbage Chunfeng 007 reached 13.83 kg·hm^-2, 26.72 g·hm^-2, and 365.28 g·hm^-2, respectively. The N, P₂O₅, and K₂O fertilizer utilization rates were 17.25%, -5.03%, and -8.13%, respectively.

Key words: cabbage, fertilizer application, yield, N, P₂O₅, K₂O