ABSTRACT Safe disposal of feedlot manure is an increasing problem throughout the world. A field experiment was established on a duplex sandy loam soil (Alfisol) in Northern NSW, Australia to determine the dry matter (DM) crop response and the fate of nutrients derived from cattle feedlot manure and inorganic fertilizer applications. The five treatments imposed over a three year period were no manure or inorganic fertilizer (NM), a moderate annual manure application (20–25 t DM ha−1) -/+ N (MA, MAN) a high initial application in year 1 (60 t DM ha−1 + N, HIN) and an inorganic fertilizer treatment (single superphosphate, KCl, urea, I) applied in each year. Vegetative yields of forage sorghum (Sorghum bicolor cv. Super-Dan) and triticale (Triticosecale spp. cv. Madonna) were recorded in crops grown in sequence over a three-year period. A mass balance approach was used to quantify nutrient gains to, and losses from the system. Total crop yield was 14.22 t dry matter (DM) ha−1 in the NM treatment with an approximate threefold increase with HIN and I. Removal of nutrients (kg ha−1) in harvested forage was highest for N, K and S in the I treatment (767 N, 1447 K, 76 S) and highest for P in the HIN treatment (189 P). There was no accumulation of NO3 in the soil layers to the B horizon in the manure treatments which contrasts with I. In the manure treatments there was a 6 to 8 fold increase over the initial value in Colwell bicarbonate extractable P in the 0–10 cm soil horizon in the MAN and HIN treatments, a decline in exchangeable K, an increase in EC and a loss of P sorption capacity. Supplemental inorganic nitrogen has been found to increase the nutrient benefits of feedlot manure. Accumulation of soil phosphate and salts, and a decline in soil K was found and needs to be closely monitored to maintain productivity and the environment.

中文翻译：

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饲养场粪肥和氮添加对牧草产量、养分平衡和土壤硝酸盐、磷酸盐和盐度的影响

摘要 饲养场粪便的安全处理是世界范围内日益严重的问题。在澳大利亚新南威尔士州北部的双层砂壤土 (Alfisol) 上进行了田间试验，以确定干物质 (DM) 作物的反应以及来自牛饲养场粪便和无机肥料应用的养分的归宿。在三年期间施加的五种处理是不施肥或无机肥料（NM），中等年施肥量（20-25 t DM ha-1）-/+ N（MA，MAN）在第 1 年高初始施用(60 t DM ha−1 + N, HIN) 和无机肥料处理（单一过磷酸钙、KCl、尿素、I）每年施用。在三年期间按顺序种植的作物中记录了草料高粱（Sorghum bicolor cv. Super-Dan）和黑小麦（Triticosecale spp. cv. Madonna）的营养产量。使用质量平衡方法来量化系统的养分增益和损失。在 NM 处理中，作物总产量为 14.22 t 干物质 (DM) ha−1，HIN 和 I 增加了大约三倍。收获草料中营养物质的去除（kg ha−1）对于 N、K 和 S 来说是最高的I 处理 (767 N, 1447 K, 76 S) 和最高的 P 在 HIN 处理 (189 P)。与 I 相比，粪肥处理中土壤层中没有 NO3 积累到 B 层。在粪肥处理中，0-10 cm 处 Colwell 碳酸氢盐可提取 P 的初始值增加了 6-8 倍MAN 和 HIN 处理中的土壤层、可交换 K 的下降、EC 的增加和 P 吸附能力的损失。已发现补充无机氮可增加饲养场粪便的营养价值。发现土壤磷酸盐和盐分的积累以及土壤钾的下降，需要密切监测以保持生产力和环境。