Nutrient Balance Analysis of N,P,K,B,Mn and Fe in Spring Brassica oleracea'Lvfeng 2'
Through nutrient deficiency experiments and comparative experiments at different levels of fertilizer application,the absorption and utilization characteristics of six elements,including N,P2 O5,K2 O,B,Mn and Fe,were studied in Brassica oleracea'Lvfeng 2',providing a basis for increasing fertilizer application efficiency and scientific fertilization in heading cabbage.Through nutrient deficiency experiments,it was found that when there was a high content of available phosphorus and potassium in the soil,applying phosphorus or potassium fertilizer a-gain could not increase the yield of cabbage,but instead would reduce it;applying nitrogen fertilizer could 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 decreased.The average ratio of N,P,and K nutrient absorption in the'Lvfeng 2'cabbage was13.39∶8.00∶29.86,and the average ratio of B,Mn,and Fe nutrient absorption was 52.28∶83.36∶158.01.When the target yield was 70 392 kg/hm2,the application rates of N,P2 O5,and K2 O reached 91.03,55.67 and 210.24 kg/hm2,and the application rates of B,Mn,and Fe reached 57.44,85.58 and 171.53 g/hm2,the nutrient balance in the soil during the season can be maintained.The agricultural efficiency of N P K fertilizer was 130.33,11.10 and 6.44 kg/kg,respectively.
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