Novel water- and fertilizer-management strategy: Nutrient-water carrier
Novel water- and fertilizer-management strategy: Nutrient-water carrier
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新型水肥管理策略：养分水载体
DOI：
10.1016/j.jclepro.2021.125961
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发表时间：
2021-01-22
影响因子：
11.1
通讯作者：
Cheng, Dongdong
中科院分区：
文献类型：
--
作者：
Wang, Jinpeng;Chen, Huiyu;Cheng, Dongdong
本研究提出了一种新的水肥管理策略--营养水载体。以N，O-羧甲基壳聚糖（NOCMC）、丙烯酸（AA）、聚磷酸脲（PDUP）为原料，采用溶液聚合法制备营养水载体（NC）。NC的营养成分含量在70%以上，具有良好的保水性和缓释性。结果表明，当中和AA的质量分数为75%，NOCMC的质量分数为10%，PDUP的质量分数为5%，APS的质量分数为0.6%，MBA的质量分数为AA质量的0.05%，反应温度为70 ℃，反应时间为2.0h时，制得的吸水性树脂的吸水倍率为791.26g/g。当PDUP占AA质量的25wt%时，NC的溶胀度达到482.59g/g。采用FTIR、SEM、EDS、TG等手段对优化后的NC进行了结构和性能表征。结果表明，线型PUDUP与高吸水性网络形成半互穿结构（semi-IPN），NC可显著提高桑迪壤土的持水能力，比未加NC时提高6倍。此外，在桑迪壤土上施用NC对玉米根长和苗高具有正协同效应。此外，还研究了氮、磷、钾的缓释行为。结果表明，有机肥具有提高养分利用率、延长肥料释放期、减少灌溉次数、解决环境污染等优点，有望在半干旱和干旱地区推广应用。(c)2021爱思唯尔有限公司版权所有。
A novel waterand fertilizer-management strategy has been developed in the study, which was called nutrient-water carrier. The nutrient-water carrier (NC) was prepared from N, O-carboxymethyl chitosan (NOCMC), acrylic acid (AA) and polyphosphate urea (PDUP) by solution polymerization. The nutrients content of NC was more than 70%, and it showed excellent water-retention and slow-released capacity properties. The optimal superabsorbent sample with excellent water absorbency (791.26 g/g) was obtained under the condition: 75% of AA neutralized, 10 wt% NOCMC, 5 wt% PDUP, 0.6 wt% APS, 0.05% MBA to AA weight, reaction at 70 degrees C for 2.0 h. After loading 25 wt% PDUP to AA weight into the polymer network, the swelling degree (SD) of optimal NC arrived 482.59 g/g. FTIR, SEM, EDS and TG were used to characterize the structure and performance of optimal NC. Results illustrated that the semi interpenetrate structure (semi-IPN) was constructed by the incorporation of linear PUDUP into the superabsorbent network, and the NC could dramatically enhance the water holding capacity of sandy loam, six-folders than without NC. In addition, the application of NC in sandy loam soil had a positive synergistic effect on the root length and seedling height of maize. Furthermore, the slow-released behavior for N, P and K was investigated. All the facts indicated that the NC could improve nutrients efficiency, prolong the period of fertilizer release, decrease irrigation frequency and address environmental pollution, which was expected to be widely used in semi-arid and arid areas.(c) 2021 Elsevier Ltd. All rights reserved.