PROBABLE ROLE OF CALCIUM COMPOUNDS IN INCREASING CROP YIELDS ON DEEP-PLOWED SOLONETZ SOIL
PROBABLE ROLE OF CALCIUM COMPOUNDS IN INCREASING CROP YIELDS ON DEEP-PLOWED SOLONETZ SOIL
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DOI：
10.4141/cjss72-051
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发表时间：
1972-10
影响因子：
1.7
通讯作者：
R. Cairns
中科院分区：
文献类型：
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作者：
R. Cairns
四种 Solonetz 土壤的 Ap 层和 Ap-Bnt 层混合物样品分别用 NH4NO3、CaSO4 和 CaCO3 单独或组合处理。碳酸钙增加了土壤 pH 值，NH4NO3 对土壤 pH 值没有持久影响，而 CaSO4 相对于未经处理但种植过作物的土壤则降低了 pH 值，并且其影响随着时间的推移而增加。在 CaCO3 处理的土壤上生长的幼苗回收的额外氮量与在用 200 ppm NH4NO3 处理的土壤上生长的幼苗回收的额外氮量大致相同。产量随着施氮量的增加而增加，钾的吸收量也随着施氮量的增加而增加。然而，在对植物几乎没有提供钾的土壤中施用钾并不会导致产量大幅增加。硫酸钙仅在一种土壤上种植第一季作物和在另一种土壤上种植第二季作物时才能增加产量。结论是，由于深耕，增加了 Solonetz 土壤 Ap 层的 pH 值，从而增加了植物对土壤氮的利用率。
Samples of Ap horizon and Ap–Bnt horizon mixtures of four Solonetz soils were treated with NH4NO3, CaSO4, and CaCO3 singly and in combinations. Calcium carbonate increased the soil pH, NH4NO3 had no lasting effect on soil pH, and CaSO4 decreased the pH relative to that of untreated but cropped soils and its effect increased with time. Seedlings grown on CaCO3-treated soil recovered about the same amount of additional N as seedlings grown on soil treated with 200 ppm NH4NO3. Yield increased with N supply and K uptake increased with N uptake. However, the application of K to a soil that provided little to plants did not cause a very great yield increase. Calcium sulfate increased yields only with the first crop on one soil and with the second crop on another soil. It was concluded that increasing the pH of the Ap horizon of Solonetz soils, as results from deep plowing, increases the availability of soil N to plants.