Journal
PROCESSES
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/pr11113253
Keywords
rhizosphere soil; non-rhizosphere soil; tillage methods; nitrogen; enzyme activities
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The tillage method in farming systems plays a crucial role in increasing fertilizer uptake by plant roots and preventing environmental pollution. This field study investigated the characteristics of nitrogen content and enzyme activities in rhizosphere soil under different tillage methods. The results showed that continuous no-till (CN) had the highest nitrogen content and enzyme activities, making it the recommended tillage method for improving macronutrient availability and soil enzyme activities.
The tillage method in farming systems is essential to develop strategies to increase fertilizer uptake by plant roots and to avoid environmental pollution. The field study aimed to investigate the characteristics of nitrogen and enzyme activities in rhizosphere soil with different tillage methods. Four treatment plots applied with fertilizers were established: continuous rotary tillage (CR), plowing-rotary tillage (PR), continuous no-till (CN) and ploughing-no-till (PN). The total content of nitrogen in chernozem was high during early stages of plant growth, and then it decreased with the maize growth. In the rhizosphere soil, the total N accounted 1314.45, 1265.96, 1120.47, 1120.47, 1204.05 mgkg(-1) of CR, PR, CN, and PN, respectively, which were markedly greater than that of non-rhizosphere soil (1237.52, 1168.40, 984.51, 1106.49 mgkg(-1) of CR, PR, CN, and PN, respectively). At first growth stages, content of NH4+-N and NO3--N in two soil regions was low, then increased gradually, which followed the order of CR < PR < PN < CN. The rhizosphere soil showed slightly higher concentration of NH4+-N and NO3--N than non-rhizosphere. The soil enzymes were more active in the rhizosphere soil than that of non-rhizosphere during the whole maize growth stages. Due to minimal damage to the soil environment and optimal soil moisture and temperature, the urease and catalase activities were greatest in the rhizosphere for CN treatment. Therefore, CN was recommended to be used by farmers for the improvement of macronutrient availability and soil enzyme activities in the soil.
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