Abstract

It was found that low humus content and low biological activity of virgin chestnut soils of Western Transbaikalia cause a low gross amount of sulfur. The distribution of sulfur along the profile gradually decreases with some accumulation in the carbonate horizon. Prolonged irrigation caused by an increase in humus content and biological activity contributed to an increase in the amount of sulfur, which practically increases with the depth of the profile. The stock of mobile sulfates irrigated in a layer of 0–20 cm was three times higher than in virgin soil (7.3 and 2.4 kg/ha, respectively); it also was 1.3 times higher in the 0–50 cm layer and 2.9 times higher in the 0–100 cm layer. According to the content and reserves of mobile sulfur, chestnut soils in a layer of 0–20 cm are classified as low-income. After 3 years of using increasing doses of sulfur fertilizers (against the background of NPK) for irrigated potatoes, the content of all forms of sulfur in the soil increased depending on the dose size. The following pattern was revealed: the amount of S_org in the soil and the enrichment of humus with it increased with an increase in the dose and the ratio C : S_org decreased. A negative sulfur balance was found in the control and in the background versions. The introduction of the lowest dose of S15 has already formed a positive balance, but it is necessary to apply a dose of S30 (against the background of NPK) in compliance with irrigation standards because chestnut soils are depleted of mobile sulfur.

中文翻译：

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非灌溉和灌溉板栗土壤中的硫以及增加马铃薯硫肥（含氮磷钾）剂量的评价

摘要

研究发现，西外贝加尔地区的原始板栗土壤腐殖质含量低、生物活性低，导致总硫含量低。硫沿剖面的分布逐渐减少，并在碳酸盐层中积累了一些。由于腐殖质含量和生物活性增加而导致的长时间灌溉导致硫含量增加，实际上随着剖面深度的增加而增加。0-20 厘米层中灌溉的流动硫酸盐储量是原始土壤的三倍（分别为 7.3 和 2.4 千克/公顷）；0-50 cm 层的值高出 1.3 倍，0-100 cm 层的值高出 2.9 倍。根据流动硫的含量和储量，将0~20cm土层的板栗土划分为低收益土。在灌溉马铃薯中使用增加剂量的硫肥（以氮磷钾为背景）三年后，土壤中各种形式的硫的含量随着剂量的大小而增加。结果表明：随着剂量的增加，土壤中S _org的量和腐殖质的富集量增加，而C : S _{org 的}比率降低。在对照和背景版本中发现负硫平衡。引入最低剂量的S15已经形成了正平衡，但由于板栗土壤缺乏流动硫，有必要在符合灌溉标准的情况下施用一定剂量的S30（以氮磷钾为背景）。