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Comparison of different organic amendments on potassium release from two fine-textured soils

机译：两种细色织细土壤钾释放的不同有机修正的比较

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摘要

Potassium (K) availability in calcareous soils of Iran has been decreased due to intensive crop production and little K application. We hypothesized that different organic materials may affect K release from these soils. For this purpose, release of K from two clayey calcareous soils treated with different organic materials including alfalfa, broad bean, barley, and pea residues; camel, cow, pigeon, poultry, quail, and sheep manures; and household vermicompost was studied. The experiment was a completely randomized factorial arrangement, and factors were organic material treatment, moisture regime, and soil type. Soil samples were treated with 2% of each organic amendment and incubated for 60?days at 22?±?3?°C under two moisture conditions (field capacity and saturation). Then, kinetics of K release from soil samples during 180?min was determined. Results indicated that all organic amendments (except camel manure) increased K release from soil samples. The highest and lowest contents of K release were found in samples treated with sheep and camel manures, respectively (1280 and 403?mg?kg_(?1), respectively). Cambisol with palygorskitic mineralogy released more K than Vertisol with smectitic mineralogy. Generally, the moisture condition had no significant effect on soil K release. The parabolic diffusion equation was the best model to describe K release from all soil samples. The mean value of equation slope (b) for Cambisol was significantly higher than that for Vertisol (65 vs. 61?mg?kg_(?1)?min_(?0.5)). Generally, the highest content of K release was observed in palygorskitic Cambisols treated with sheep manure under field capacity moisture condition. These results indicated that organic material application could be a promising strategy on K fertility management of clayey soils.
机译：由于集约化的作物生产和小K应用，伊朗钙质土壤中的钾（k）钾（K）可用性已减少。我们假设不同的有机材料可能影响来自这些土壤的K释放。为此目的，从两种粘土钙质土壤中释放，用不同的有机材料处理，包括紫花苜蓿，蚕豆，大麦和豌豆残留物;骆驼，牛，鸽子，家禽，鹌鹑和羊群;和家庭蚯蚓氏菌进行了研究过。实验是完全随机的因子安排，因素是有机材料处理，湿度制度和土壤类型。用2％的有机修正处理土壤样品，并在两个水分条件下在22？±3°C（现场容量和饱和度）时温育60.？天。然后，测定了在180℃的180℃下从土壤样品中释放的动力学。结果表明，所有有机修改（骆驼粪除外）增加了k从土壤样品中释放。在用绵羊和骆驼灌注处理的样品中发现了最高和最低含量的K释放含量（分别为1280和403Ω·mg？kg _（α1））。柬埔寨与帕莱戈斯氏矿物学，释放比与蒙脱石的Vertisol更多的k。通常，水分状况对土壤K释放没有显着影响。抛物线扩散方程是描述来自所有土壤样品的k释放的最佳模型。柬宾醇的平等斜率（B）的平均值显着高于Vertisol（65Vs.61≤mg≤kg_（α1）？min _（？0.5））。通常，在现场容量水分状况下，在用绵羊粪便处理的腭氏霉菌癌症中观察到最高含量的K释放。这些结果表明，有机材料应用可能是粘土土壤K生育管理的有希望的策略。

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