Abstract

Byproducts have been used in agriculture to improve soil properties and provide plant nutrients. This study utilized flue gas desulfurization gypsum (FGDG), biochar, bed ash, broiler litter ash (BLA) and their combinations on the amelioration of soil acidity. Calcium carbonate (CaCO₃) was used as the lime source and alfalfa as the test crop. While amendments increased alfalfa shoot and root yields as well as tissue Ca concentration, the tissue concentrations of copper, manganese, lead and zinc did not increase with amendment. Bed ash was as effective as CaCO₃ in reducing soil acidity to a depth of 36 cm while calcium in the FGDG was more soluble than Ca in the CaCO₃. With the increased alfalfa yield and the reduced tissue metal concentrations when these byproducts were used, this demonstrates that at the rate used in this study, these byproducts could be use as amendment on acidic soils.

摘要

副产品已用于农业以改善土壤特性并提供植物养分。本研究利用烟气脱硫石膏 (FGDG)、生物炭、床灰、肉鸡垫料灰 (BLA) 及其组合改善土壤酸度。碳酸钙（CaCO ₃）用作石灰源，苜蓿用作试验作物。虽然改良剂增加了苜蓿芽和根的产量以及组织钙浓度，但铜、锰、铅和锌的组织浓度并未随改良剂增加。床灰在将土壤酸度降低至 36 cm深度方面与 CaCO ₃一样有效， 而 FGDG 中的钙比 CaCO _{3 中的}Ca 更易溶. 随着使用这些副产品时苜蓿产量的增加和组织金属浓度的降低，这表明在本研究中使用的速率下，这些副产品可以用作酸性土壤的改良剂。