The use of black soldier fly frass fertilizer (BSFFF) is being promoted globally. However, information on nitrogen (N) fertilizer equivalence (NFE) value and synchrony of N mineralization for crop production remains largely unknown. Comparative studies between BSFFF and commercial organic fertilizer (SAFI) were undertaken under field conditions to determine synchrony of N release for maize uptake. The BSFFF, SAFI, and urea fertilizers were applied at the rates of 0, 30, 60, and 100 kg N ha⁻¹. The yield data from urea treated plots were used to determine the NFE of both organic inputs. Results showed that maize from BSFFF treated plots had higher N uptake than that from SAFI treated plots. High N immobilization was observed throughout the active growth stages of maize grown in soil amended with BSFFF, whereas soil treated with SAFI achieved net N release at the silking stage. Up to three times higher negative N fluxes were observed in SAFI amended soils as compared with BSFFF treated plots at the tasseling stage. The BSFFF applied at 30 and 60 kg N ha⁻¹ achieved significantly higher NFE than all SAFI treatments. Our findings revealed that BSFFF is a promising and sustainable alternative to SAFI or urea for enhanced maize production.

中文翻译：

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黑士兵蝇Fra肥料氮肥当量与玉米氮素矿化同步

全球正在推广使用黑士兵蝇fr肥料（BSFFF）。然而，关于氮（N）肥料当量（NFE）值和氮矿化与作物生产同步性的信息仍然未知。在田间条件下，进行了BSFFF和商品有机肥料（SAFI）的比较研究，以确定氮素吸收与玉米吸收的同步性。BSFFF，SAFI和尿素肥料的施用量分别为0、30、60和100 kg N ha ^-1。尿素处理区的产量数据用于确定两种有机投入物的NFE。结果表明，BSFFF处理的地块的玉米吸收氮的量高于SAFI处理的地块。在用BSFFF改良的土壤中生长的玉米的整个活跃生长阶段都观察到了高氮固定化，而用SAFI处理过的土壤在蚕丝期实现了净氮释放。在抽雄阶段，在SAFI改良土壤中观察到的负N通量是BSFFF处理地的三倍。与所有SAFI处理相比，在30和60 kg N ha ^-1下施用的BSFFF的NFE明显更高。我们的发现表明，BSFFF是SAFI或尿素的有希望且可持续的替代品，可以提高玉米产量。