Effect of localized application of bio-organic fertilizer on the temporal and spatial distribution of soil enzyme activities under drip irrigation
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DOI:10.7606/j.issn.1000-7601.2019.02.15
Key Words: bio-organic fertilizer  soil enzyme activities  drip irrigation  fertilization method  drip location
Author NameAffiliation
CHANG Wen-ying The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group/College of Agronomy of Shihezi University, Shihezi, Xinjiang 832000, China 
HE Qian The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group/College of Agronomy of Shihezi University, Shihezi, Xinjiang 832000, China 
LI Jun-hua The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group/College of Agronomy of Shihezi University, Shihezi, Xinjiang 832000, China 
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Abstract:
      The experiment combined two different fertilization methods with two different dripper positions under drip irrigation. The 4 treatments were: B0, B30, BU, and CK. Soil samples were selected from the horizontal positions 0, 5, 15 cm and 30 cm from fertilization points at vertical depth of 0~20, 20~40 cm, and 40~60 cm on the 3, 7, 15, 30 d and 60 d after fertilization. The activity of urease, sucrase, and alkaline phosphatase of the samples were measured. The results showed that the urease activity in each layer reached the maximum of 17.52,12.59,5.74 mg·kg-1·h-1, respectively at the 15 d after treatment, and maximum sucrase activity appeared at the 3 d and 15 d after treatment, while the changes of alkaline phosphatase activity in each soil layer were inconsistent. The effect of bio-organic fertilizer on activities of the three soil enzymes decreased gradually with the increase in soil depth. The three soil enzyme activities decreased gradually with the increasing in soil depth. In horizontal direction, three enzyme activities of B0 and BU treatments decreased 42.12%,29.73% and 25.76% from H0 to H30, the enzyme activities of B30 decreased by 5.87%,11.30% and 3.51% from the dripper (H30) to periphery (H0), respectively, as time elapsed, the trend of soil enzyme activities changed with B0 and BU. Concentration of bio-organic fertilizer significantly increased urease by 49.40% and sucrase activities by 39.51% in 0~40 cm of soil layer, and was more conducive to the improvement of alkaline phosphatase activity in the later stage of fertilization. The difference of the three enzyme activities at different horizontal positions in the 40~60 cm of soil layer was not significant.