Illera-Vives Marta, López-Fabal Adolfo, López-Mosquera M Elvira, Ribeiro Henrique M
Instituto de Biodiversidad Agraria y Desarrollo Rural (IBADER), University of Santiago de Compostela, 27002, Lugo, Spain.
Escuela Politécnica Superior, University of Santiago de Compostela, 27002, Lugo, Spain.
J Sci Food Agric. 2015 Dec;95(15):3047-54. doi: 10.1002/jsfa.7207. Epub 2015 May 22.
Seaweed and fish waste can be composted together to obtain fertilizer with high organic matter and nutrient contents. The nutrients, however, are mostly in organic form and must be mineralized to make them available to plants. The objective of this work was to establish a usage guideline for the compost by studying its mineralization dynamics. Also, the release of inorganic N and C from soil fertilized with the compost was monitored and modelled.
C and N were released throughout the assay, to an extent significantly dependent on fertilizer rate. Mineralization of both elements fitted a first-order exponential model, and each fertilizer rate required using a specific fitting model. An increased rate favoured mineralization (especially of carbon). After 90 days, 2.3% of C and 7.7% of N were mineralized (and 23.3% of total nitrogen made plant available) with the higher rate.
C mineralization was slow because organic matter in the compost was very stable. On the other hand, the relatively high initial content in mineral N of the compost increased gradually by the effect of mineralization. The amount of N available would suffice to meet the requirements of moderately demanding crops at the lower fertilizer rate, and even those of more demanding crops at the higher rate.
海藻和鱼废料可以一起进行堆肥，以获得具有高有机质和养分含量的肥料。然而，这些养分大多以有机形式存在，必须进行矿化才能被植物利用。这项工作的目的是通过研究其矿化动态来制定该堆肥的使用指南。此外，还对施用该堆肥的土壤中无机氮和碳的释放进行了监测和建模。
在整个试验过程中碳和氮都有释放，其释放程度显著依赖于施肥量。两种元素的矿化都符合一级指数模型，且每种施肥量都需要使用特定的拟合模型。施肥量增加有利于矿化（尤其是碳的矿化）。90天后，较高施肥量下2.3%的碳和7.7%的氮被矿化（且总氮的23.3%可被植物利用）。
碳矿化缓慢，因为堆肥中的有机质非常稳定。另一方面，堆肥中矿质氮的初始含量相对较高，受矿化作用影响逐渐增加。较低施肥量下可利用的氮量足以满足需求适中作物的需求，较高施肥量下甚至能满足需求更高作物的需求。
