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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >The Effects of Four Organic Soil Conditioners on Aggregate Stability, Pore Size Distribution, and Respiration Activity in a Sandy Loam Soil
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The Effects of Four Organic Soil Conditioners on Aggregate Stability, Pore Size Distribution, and Respiration Activity in a Sandy Loam Soil

机译：四种有机土壤改良剂对沙质壤土团聚体稳定性，孔径分布和呼吸活性的影响

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In coarse-textured soils, low water and nutrient holding capacity due to the high number of macropores limits crop growth. To minimize these limitations the application of various soil conditioners (SCs) has been extensively used in recent decades. The objective of this study was to investigate the influences of anionic polyacrylamide (PAM), cattle manure (M), vermicompost (VC), and biological sludge (BS) as organic SCs on mean weight diameter (MWD) of aggregates, water aggregate stability (WAS), pore size distribution (PRSD), and respiration activity (RA) of a sandy loam soil. PAM (0.25 and 0.5 g kg-1 of air-dried soil), M (12.5 and 25 g kg-1 of air-dried soil), VC (2.5 and 5 g kg-1 of air-dried soil), and BS (1.7 and 3.4 g kg-1 of air-dried soil) were mixed with soil and uniformly packed into large and small pots, and then incubated in a greenhouse with FC moisture content of 0.7-0.8 and temperature of 22 ± 4 °C for 6 months. Large pots were used for soil sampling in order to measure MWD, WAS, and PRSD at 7, 30, 60, 120, and 180 days. Respiration activity was measured at the same times in small pots. All SCs, irrespective of their concentrations, significantly (P 75 m m) and increased the number of micropores (< 30 m m). Both PAM rates significantly (P <= 0.05) increased MWD, WAS, and the number of mesopores (30-75 m m); the increase in the number of mesopores was accompanied by a decrease in the number of macropores. BS (3.4 g kg-1) significantly (P <= 0.05) decreased the number of mesopores by increasing the number of micropores. Consequently, application of M (25 g kg-1), PAM (0.25 and 0.5 g kg-1), and BS (3.4 g kg-1) each improved the water holding capacity of the sandy loam soil by modifying PRSD.
机译：在质地较粗的土壤中，由于大孔数量众多，水分和养分保持能力低，限制了作物的生长。为了最小化这些限制，近几十年来已广泛使用各种土壤改良剂（SC）。这项研究的目的是研究阴离子聚丙烯酰胺（PAM），牛粪（M），ver粉（VC）和生物污泥（BS）作为有机SC对骨料的平均重量直径（MWD），水骨料稳定性的影响（WAS），孔径分布（PRSD）和砂壤土的呼吸活性（RA）。 PAM（0.25和0.5 g kg-1的风干土壤），M（12.5和25 g kg-1的风干土壤），VC（2.5和5 g kg-1的风干土壤）和BS （将1.7和3.4 g kg-1的风干土壤）与土壤混合，并均匀地装入大锅和小锅中，然后在FC水分含量为0.7-0.8，温度为22±4°C的温室中孵育25分钟。 6个月。为了在7、30、60、120和180天测量MWD，WAS和PRSD，使用大盆进行土壤采样。在小盆中同时测量呼吸活动。所有SC，无论其浓度如何，均显着（P 75 m m）并增加了微孔数量（<30 m m）。两种PAM率均显着（P <= 0.05）增加了MWD，WAS和中孔数量（30-75 m m）。中孔数量的增加伴随着大孔数量的减少。 BS（3.4 g kg-1）通过增加微孔数量显着（P <= 0.05）减少了中孔数量。因此，通过改良PRSD，施用M（25 g kg-1），PAM（0.25和0.5 g kg-1）和BS（3.4 g kg-1）均可提高沙壤土的持水能力。

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