{"title":"Nitrogen fertilizer replacement values of organic amendments: determination and prediction","authors":"Dorien Westerik, Ellis Hoffland, Renske Hijbeek","doi":"10.1007/s10705-023-10316-7","DOIUrl":null,"url":null,"abstract":"Abstract The nitrogen fertilizer replacement value (NFRV) quantifies the value of organic amendments as a nitrogen (N) fertilizer, and is commonly defined as the extent to which organic fertilizer N can replace mineral fertilizer N. NFRVs can be calculated by comparing the crop N uptake from equal N application rates of mineral and organic fertilizer, or by comparing the N rates of both fertilizers needed to obtain equal crop N uptake. Currently, NFRVs are mainly known for animal manure, whereas other organic waste products may become available as fertilizer products in the future. In this study, a pot experiment with spring wheat was performed to (1) assess NFRVs of a range of organic amendments; (2) compare NFRVs based on equal N application with NFRVs based on equal N uptake; and (3) assess which product characteristics explain observed variation. Observed NFRVs varied between 6.2 and 78.8%, with the lowest value for raw food waste and the highest for fishmeal. NFRVs were overestimated when calculated based on equal N application rate (with on average 6.9% point), and more so at high N application rate (9.0% point). NFRVs should therefore be calculated based on equal N uptake from organic and mineral fertilizers. Nitrogen concentration of the organic fertilizer provided the best explanation of variation observed in NFRVs (R 2 = 0.86). These findings give valuable insights into the large variation in value of organic waste streams as organic fertilizer and can support decisions on sustainable N application rates, to increase crop N uptake and reduce N losses to the environment.","PeriodicalId":19336,"journal":{"name":"Nutrient Cycling in Agroecosystems","volume":"124 1","pages":"0"},"PeriodicalIF":2.4000,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nutrient Cycling in Agroecosystems","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s10705-023-10316-7","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"SOIL SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
Abstract The nitrogen fertilizer replacement value (NFRV) quantifies the value of organic amendments as a nitrogen (N) fertilizer, and is commonly defined as the extent to which organic fertilizer N can replace mineral fertilizer N. NFRVs can be calculated by comparing the crop N uptake from equal N application rates of mineral and organic fertilizer, or by comparing the N rates of both fertilizers needed to obtain equal crop N uptake. Currently, NFRVs are mainly known for animal manure, whereas other organic waste products may become available as fertilizer products in the future. In this study, a pot experiment with spring wheat was performed to (1) assess NFRVs of a range of organic amendments; (2) compare NFRVs based on equal N application with NFRVs based on equal N uptake; and (3) assess which product characteristics explain observed variation. Observed NFRVs varied between 6.2 and 78.8%, with the lowest value for raw food waste and the highest for fishmeal. NFRVs were overestimated when calculated based on equal N application rate (with on average 6.9% point), and more so at high N application rate (9.0% point). NFRVs should therefore be calculated based on equal N uptake from organic and mineral fertilizers. Nitrogen concentration of the organic fertilizer provided the best explanation of variation observed in NFRVs (R 2 = 0.86). These findings give valuable insights into the large variation in value of organic waste streams as organic fertilizer and can support decisions on sustainable N application rates, to increase crop N uptake and reduce N losses to the environment.
期刊介绍：
Nutrient Cycling in Agroecosystems considers manuscripts dealing with all aspects of carbon and nutrient cycling as well as management and examining their effect in ecological, agronomic, environmental and economic terms. Target agroecosystems include field crop, organic agriculture, urban or peri-urban agriculture, horticulture, bioenergy, agroforestry, livestock, pasture, and fallow systems as well as their system components such as plants and the fertility, chemistry, physics or faunal and micro-biology of soils. The scale of observation is the cycles in the soil-plant-animal system on or relevant to a field or watershed level as well as inputs from or losses to the anthroposphere, atmosphere and hydrosphere. Studies should thus consider the wider system in the examination of cycling and fluxes in agroecosystems or their components. These may include typically multi-year field observations, farm gate budgets, watershed studies, life cycle assessments, enterprise and economic analyses, or regional and global modeling. Management objectives may not only include the maximization of food, fiber and fuel production, but also its environmental and economic impact. The results must allow mechanistic conclusions of broad applicability and distinguish itself from empirical results or case studies of merely local or regional importance. If unsure whether a study fits into this scope, please contact the editor with a brief inquiry before manuscript submission.
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