Solubility and leachability of fishwaste compost phosphorus in soilless growing media
Solubility and leachability of fishwaste compost phosphorus in soilless growing media
复制标题
DOI：
10.2134/jeq1999.00472425002800010019x
复制
发表时间：
1999-01-01
影响因子：
2.4
通讯作者：
Winters, D
中科院分区：
文献类型：
--
作者：
Kuo, S;Hummel, RL;Winters, D
鱼粪堆肥磷的溶解性和可吸收性的知识是必要的，有效地利用鱼粪堆肥作为无土栽培介质中的磷源。鱼粪堆肥含磷3.6 g kg（-1）（干重），磷溶解度高，用0.01 M NaCl连续6次提取，可提取堆肥中总磷的64.4%。在稀盐溶液中，从堆肥释放的钙磷的P。顺序提取没有证实，Ca-P是主要的P形式在堆肥中，因为大量的P溶解在0.01 M NaCl是从不稳定的P（NH 4Cl-P）和潜在的不稳定的P（Fe-和AI-P）池。高溶解度的堆肥P导致的P浓度的升高，在10周以上的P淋溶的累积量时，生长介质含有25%或更多的堆肥灌溉与高架喷灌。幼杜鹃（Rhododendronfortunei 'Scintilation'）没有显著（P > 0.05）减少50%或更高堆肥处理的P淋失，因为植物叶片中积累的P量占堆肥和磷肥组合中P的3 +/- 0.9（SD）%。为了减少磷的淋失和减少非点源磷污染，应限制在含有鱼粪堆肥的无土栽培基质中添加磷肥。否则，培养基中堆肥的比例应限制在25%或更低，除非与控制滴灌结合使用。
Knowledge of solubility and leachability of fishwaste compost P is needed to effectively use fishwaste compost as a P source in soilless growing media. The fishwaste compost contained 3.6 g P kg(-1) compost on a dry weight basis and had high P solubility, with 64.4% of the total P in the compost extractable by six successive extractions with 0.01 M NaCl. In the dilute salt solution, the Ca release from the compost paralleled that of P. The sequential extraction did not substantiate that Ca-P was the predominant P form in the compost, because substantial amounts of P solubilized in 0.01 M NaCl were from the labile P (NH4Cl-P) and potentially labile P (Fe- and AI-P) pools. High solubility of the compost P resulted in elevation of P concentrations in leachates and cumulative amounts of P leached over 10 wk when the growing media containing 25% or more compost was irrigated with overhead sprinkler irrigation. Young rhododendron (Rhododendron fortunei 'Scintillation') did not significantly (P > 0.05) reduce P leaching from the 50% or higher compost treatments because the amount of P accumulated in the plant leaves represented 3 +/- 0.9 (SD)% of P in the compost and P fertilizer combined. To reduce P leaching and minimize nonpoint P pollution, additions of P fertilizer to the soilless growing media containing the fishwaste compost should be restricted. Otherwise, the proportion of the compost in the media should be limited to 25% or less, unless it is used in conjunction with controlled drip irrigation.