Abstract:

In order to investigate the relationship between nitrogen nutrition release and plant uptake in seaweed fertilizer and other different fertilization, the pot culture was used to study the effects of seaweed fertilizer, organic and inorganic fertilizers with the same nitrogen content on vegetable soil nitrogen mineralization and nitrogen use efficiency of spring Chinese cabbage. The results indicated that soil mineralization capacity was significantly affected by different fertilization treatments. The mineralized nitrogen was affected nitrate content in soil. The ammonium content was kept a low level at all times, and changed smaller amplitude. The dry weight of different treatments of spring Chinese cabbage sequence was NPK>S>MS. There was no significantly different between all the treatments except MNPK treatment. The soil nitrogen apparent net mineralization and spring Chinese cabbage nitrogen uptake dose sequence were NPK>S>MS>CK>M and MNPK in experiment conditions. The nitrogen use efficiency of NPK treatment was the highest in all treatments which was 67.7%. And the S and MS treatment was 46.9% and 4.8% respectively. The dry weight of spring Chinese cabbage was correlated with the nitrogen uptake content significantly (R2=0.9213, n=18), which had importance effect to yield formation of spring Chinese cabbage. The effect of S and NPK treatment on spring Chinese cabbage yield increase was almost the same at the same nitrogen utilization.