Current knowledge indicates that sugarcane straw is a short-term sink of fertilizer nitrogen (N) due to N immobilization during the decomposition process. This study aimed to determine whether sugarcane straw removal from the field benefits the N-fertilizer recovery by plant (NRP), and if legume cultivation will further improve NRP. Half of a field was planted with sunn hemp (Crotalaria spectabilis) and half was left fallow. In the second ratoon, treatments with 0, 50, and 100% of sugarcane straw maintenance levels were installed, receiving 120 kg ha⁻¹ N over straw. A microplot of ammonium nitrate labeled with 1.99% atoms ¹⁵N was included. NRP was quantified at 92, 164, and 264 days after fertilization (DAF). At harvest (264 DAF), soil samples and straw (<4 mm and >4 mm fractions) were collected to determine N-fertilizer recovery in the soil (NRS) and in the straw (NRSt). Maintaining 50 and 100% of straw improved NRP over the sugarcane cycle. NRP was not improved by crop rotation cultivation and NRS averaged 50% in the entire soil profile. NRSt at harvest averaged 1–3% in the 50% and 100% straw levels. Contrary to the current view, N-fertilizer immobilization in the straw was negligible and keeping straw could improve NRP. The findings indicate that increasing N rates in green cane trash blanket system to compensate for the N-fertilizer immobilization is not necessary, and that straw removal for bioenergy production will change the short-term demand for N-fertilizer.

目前的知识表明，由于分解过程中氮的固定化，甘蔗秸秆是肥料氮（N）的短期吸收。这项研究旨在确定从田间去除甘蔗秸秆是否有利于植物氮肥的回收（NRP），以及豆科植物的种植是否会进一步改善NRP。一半的田地种植了麻麻（Crotalaria spectabilis），另一半则被休耕。在第二个宿根，用甘蔗稻草维护级别0，50％，和100％的处理分别安装，接收120公斤公顷^-1 Ñ过吸管。标记有1.99％原子的硝酸铵微图¹⁵N被包括在内。在受精（DAF）后92、164和264天对NRP进行定量。在收获时（264 DAF），收集土壤样品和秸秆（小于4毫米且大于4毫米的部分）以确定土壤（NRS）和秸秆（NRSt）中的氮肥回收率。在甘蔗周期中，保持50％和100％的秸秆可改善NRP。轮作不会改善NRP，NRS在整个土壤剖面中平均为50％。在50％和100％的秸秆水平下，收获时的NRSt平均为1-3％。与当前观点相反，将秸秆中的氮肥固定化是微不足道的，保留秸秆可以改善NRP。研究结果表明，无需增加绿色甘蔗垃圾毯系统中的氮素含量来补偿氮肥的固定化，