关键词: 氮肥利用率, 氮肥利用率

Abstract:

The laboratory and field experiments of microbial organic fertilizer application were undertaken to test the effects on maize production and organic matter, total nitrogen (TN), total phosphorus (TP), available phosphorus (AP) and available potassium (AK) in saline-alkali soil. The results showed that the yield of fertilized plot was 7652.10 g/7 m2 to 8609.17 g/7 m2, which were significantly higher than that of the control plot (6782.30 g/7 m2), root length, root dry weight, plant height, seeding dry weight and secondary root in the indoor pot experiment of all treatments was significantly higher than that of the control. The application with microbial organic fertilizer had an improvement on soil nutrients and increased the content of organic matter, total nitrogen, total phosphorus, available phosphorus and available potassium. The content of total nitrogen and phosphorus was 0.83% and 0.97% higher than the CK in field A treatment, the content of available phosphorus (A treatment) and potassium (C treatment) was 5.56 mg/kg and 15.04 mg/kg higher than the CK. The trend was the same to indoor pot experiment. The effect of Available potassium on root height and weight of maize showed a marked positive correlation, coefficient correlation was 0.6628 and 0.5399, respectively. The effect of total nitrogen and available phosphorus on ear weight and yield per plot of maize also showed a marked positive correlation. The result predicated that the use of microbial organic fertilizer could improve saline-alkali soil and increase maize production.