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	The new Caribbean Nitrogen Index to assess nitrogen dynamics in vegetable production systems in southwestern Puerto Rico
	Oliveras-Berrocales Miguel; Sotomayor-Ramirez David; Delgado Jorge A; Perez-Alegria Luis R
来源期刊	International Soil and Water Conservation Research
ISSN	2095-6339
出版年	2017
卷号	5 期号:1 页码:69-75
英文摘要	Nutrient loss from agricultural fields is one of the main factors influencing surface- and ground-water quality. Typical fertilizer nitrogen (N) consumption rates in vegetable production systems and horticultural crops in Puerto Rico fluctuate between 112 and 253 kg N/ha. The nitrogen use efficiency of vegetable crops is low, increasing the potential for nitrogen losses and high residual soil nitrate content. Quantification of residual soil N and N losses to the environment can be a difficult task. Simulation models such as the USDA-ARS N Index can be used to identify the relative magnitude of varying N-loss pathways and to identify best management practices. Field studies were conducted to quantify residual soil N and crop N removal, and to validate the Nitrogen Index in onion, tropical pumpkin and tomato production systems in the Lajas Valley in southwestern Puerto Rico. Relationships between observed and simulated values were determined to examine the capability of the model for evaluating N losses. There was good correlation between observed and predicted values for residual soil N (r =0.88) and crop N removal (r =0.99) (p < 0.05). In the production systems evaluated, the N volatilization losses ranged from 1 to 4 kg N/ha, the denitrification losses ranged from 18 to 46 kg N/ha, the leaching losses ranged from 155 to 779 kg N/ha, and the residual soil nitrate ranged from 64 to 401 kg N/ha. The N use efficiency ranged from 15% to 39%. The results obtained showed that the Nitrogen Index tool can be a useful tool for evaluating N transformations in vegetable production systems of Puerto Rico's semi-arid zone.
英文关键词	Nitrogen index Nitrogen management Residual soil N Crop N removal
类型	Article
语种	英语
开放获取类型	Other Gold
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5975594
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335788
作者单位	Oliveras-Berrocales Miguel, USDA-NRCS, Arkansas: 2603 Federal Building, 100 E, 8th Ave, Pine Bluff, 71601, USA.; Sotomayor-Ramirez David, University of Puerto Rico, Mayaguez Campus, College of Agricultural Sciences, Department of Agroenvironmental Sciences, PO Box 9000, Mayaguez, 00680, USA.; Delgado Jorge A, USDA-ARS, Acting Research Leader, Soil Management and Sugar Beet Research Unit, 2150 Centre Ave., Building D, Suite 100, Fort Collins, 80526, USA.; Perez-Alegria Luis R, University of Puerto Rico, Mayaguez Campus, College of Agricultural Sciences, Department of Agricultural and Biosystems Engineering, USA.
推荐引用方式 GB/T 7714	Oliveras-Berrocales Miguel,Sotomayor-Ramirez David,Delgado Jorge A,et al. The new Caribbean Nitrogen Index to assess nitrogen dynamics in vegetable production systems in southwestern Puerto Rico[J],2017,5(1):69-75.
APA	Oliveras-Berrocales Miguel,Sotomayor-Ramirez David,Delgado Jorge A,&Perez-Alegria Luis R.(2017).The new Caribbean Nitrogen Index to assess nitrogen dynamics in vegetable production systems in southwestern Puerto Rico.International Soil and Water Conservation Research,5(1),69-75.
MLA	Oliveras-Berrocales Miguel,et al."The new Caribbean Nitrogen Index to assess nitrogen dynamics in vegetable production systems in southwestern Puerto Rico".International Soil and Water Conservation Research 5.1(2017):69-75.