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- W4385348045 abstract "The objective of this study was to investigate the effects of different rates of straw returning on soil aggregate stability, phosphatase activities, and the available nitrogen (N) and phosphorus (P) within different soil aggregate sizes. The experiment included five treatments: 1) no straw returning and no chemical fertilizer, 2) chemical fertilizer only (150 kg N ha -1 , 75 kg P ha -1 , and 75 kg K ha -1 ), 3) 20% straw returning with chemical fertilizer, 4) 60% straw returning with chemical fertilizer, and 5) 100% straw returning with chemical fertilizer. Soil samples were collected 3.5 years after the start of the experiment and separated into four aggregate sizes (<0.25 mm, 0.25–1 mm, 1–2 mm, and 2–7 mm) using the dry sieving method. Soil acid phosphomonoesterase (AcP) and alkaline phosphomonoesterase (AlP); phosphodiesterase (PD); pyrophosphatase (PrA) activities; and soil NO 3 − −N, NH 4 + −N, and resin-P were determined within soil aggregates. The results showed that straw returning rates did not significantly impact soil aggregate distribution. However, straw returning increased soil AcP, AlP, and PD in <2 mm aggregates, and high rates of straw returning led to high enzyme activities. Soil phosphatase activities were also higher in 1–2 mm aggregates. All straw returning and chemical fertilization treatments increased soil NO 3 − −N and resin-P concentrations but had much less effect on soil NH 4 + −N concentrations. Additionally, the study revealed that soil pH, the concentrations of NH 4 + −N, NO 3 − −N, resin-P, and CaCO 3 significantly influenced soil phosphatase activities, but their impact varied across different sizes of aggregates." @default.
- W4385348045 created "2023-07-29" @default.
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- W4385348045 date "2023-07-27" @default.
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- W4385348045 title "Phosphatase activities and available nutrients in soil aggregates affected by straw returning to a calcareous soil under the maize–wheat cropping system" @default.
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- W4385348045 doi "https://doi.org/10.3389/fenvs.2023.1208323" @default.
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