Biosolids are typically injected or incorporated into soils by tillage. However, little research has been conducted on the effects of biosolids on nitrogen (N) availability under no tillage for crop production. We conducted a three-year field study to investigate the effects of lime-stabilized (LS) and anaerobically digested (AD) biosolids on N availability in a corn (Zea mays L.) -soybean (Glycine max L.) rotation under conventional tillage (CT) and no-tillage (NT) practices. Research was established on an Orangeburg loamy sand (Fine-loamy, kaolinitic, thermic Typic Kandiudults) during 2009-2011 in Sussex County, VA. Results showed that both LS and AD biosolids increased spring soil nitrate N, plant tissue N at silking, post-season corn stalk nitrate N, grain yield, and total soil N by the end of the growing season. The "book" factors employed to estimate ammonia volatilization and organic nitrogen mineralization for the calculation of plant available N resulted in equally accurate predicted agronomic N rates for both LS and AD biosolids. This means that the same N availability factors can be used to calculate agronomic application rates for both CT and NT practices in coarse-textured soils of the Mid-Atlantic Coastal Plain.
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机译：通常通过耕作将生物固体注入或掺入土壤中。然而，很少有研究针对在不耕作的农作物下生物固体对氮（N）利用率的影响。我们进行了为期三年的田间研究，以研究石灰稳定化（LS）和厌氧消化（AD）生物固体对常规耕作下玉米（Zea mays L.）-大豆（Glycine max L.）轮作中氮素有效性的影响。 （CT）和免耕（NT）做法。在2009年至2011年间，对弗吉尼亚州苏塞克斯县的Orangeburg质壤土（细质质壤土，高岭土，热型Typic Kandiudults）进行了研究。结果表明，在生长期结束时，LS和AD生物固体均增加了春季土壤硝态氮，丝化时的植物组织氮，季后玉米秸秆硝态氮，谷物产量和土壤总氮。用于估算氨挥发和有机氮矿化以计算植物有效氮的“书本”因素导致LS和AD生物固体的预测农艺氮率均准确。这意味着在大西洋中部沿海平原的粗纹理土壤中，相同的氮素利用率可用于计算CT和NT做法的农艺施用率。
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