{"title":"Nitrogen Management for Optimum Potato Yields and Low Environmental Impact in Northwest China","authors":"","doi":"10.1007/s11540-024-09715-2","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>Understanding the changes in nitrate nitrogen (NO<sub>3</sub><sup>−</sup>-N) content in the rooting zone is crucial for reducing nitrate leaching and improving nitrogen (N) use efficiency. The main objective of this study was to investigate the effects of N management strategies on NO<sub>3</sub><sup>−</sup>-N dynamics in the main root zone (0–60 cm) at critical growth stages of drip-irrigated potatoes and to quantify the retention capacity of NO<sub>3</sub><sup>−</sup>-N at harvest in an intensive potato cropping system. Three field experiments with no N application (CK), optimized management (OM) based on a realistic yield goal and soil mineral N content (N<sub>min</sub>) and farmer practice (FP) for three potato cultivars were conducted in Inner Mongolia of Northwest China from 2014 to 2016. A total of 52 farmers with over 3000 ha of potato fields were also investigated at harvest. The results showed that OM treatment improved N use efficiency and reduced the environmental risk of N loss while ensuring potato yields compared with FP treatment. Overusing N fertilizer in farmer fields was common, but these N fertilizers only caused a temporary accumulation of NO<sub>3</sub><sup>−</sup>-N during the growing season, then it was reduced to the same level as the optimal treatment at harvest. The NO<sub>3</sub><sup>−</sup>-N retention was about 70 kg ha<sup>−1</sup> at harvest in the drip-irrigated potatoes with higher yield, and the data from farmers’ fields confirmed the universality of the NO<sub>3</sub><sup>−</sup>-N retention content. Although retentional NO<sub>3</sub><sup>−</sup>-N content in the main root zone at harvest was similar between FP and OM, obvious accumulation of NO<sub>3</sub><sup>−</sup>-N content was observed during the growing season in FP treatments increasing N loss risk to the environment. The characteristics of soil NO<sub>3</sub><sup>−</sup>-N accumulation in the root zone of drip-irrigated potatoes help to improve management strategies to maximize potato yield while minimizing environmental risks due to N fertilization.</p>","PeriodicalId":20378,"journal":{"name":"Potato Research","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Potato Research","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1007/s11540-024-09715-2","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}
引用次数: 0
Abstract
Understanding the changes in nitrate nitrogen (NO3−-N) content in the rooting zone is crucial for reducing nitrate leaching and improving nitrogen (N) use efficiency. The main objective of this study was to investigate the effects of N management strategies on NO3−-N dynamics in the main root zone (0–60 cm) at critical growth stages of drip-irrigated potatoes and to quantify the retention capacity of NO3−-N at harvest in an intensive potato cropping system. Three field experiments with no N application (CK), optimized management (OM) based on a realistic yield goal and soil mineral N content (Nmin) and farmer practice (FP) for three potato cultivars were conducted in Inner Mongolia of Northwest China from 2014 to 2016. A total of 52 farmers with over 3000 ha of potato fields were also investigated at harvest. The results showed that OM treatment improved N use efficiency and reduced the environmental risk of N loss while ensuring potato yields compared with FP treatment. Overusing N fertilizer in farmer fields was common, but these N fertilizers only caused a temporary accumulation of NO3−-N during the growing season, then it was reduced to the same level as the optimal treatment at harvest. The NO3−-N retention was about 70 kg ha−1 at harvest in the drip-irrigated potatoes with higher yield, and the data from farmers’ fields confirmed the universality of the NO3−-N retention content. Although retentional NO3−-N content in the main root zone at harvest was similar between FP and OM, obvious accumulation of NO3−-N content was observed during the growing season in FP treatments increasing N loss risk to the environment. The characteristics of soil NO3−-N accumulation in the root zone of drip-irrigated potatoes help to improve management strategies to maximize potato yield while minimizing environmental risks due to N fertilization.
期刊介绍:
Potato Research, the journal of the European Association for Potato Research (EAPR), promotes the exchange of information on all aspects of this fast-evolving global industry. It offers the latest developments in innovative research to scientists active in potato research. The journal includes authoritative coverage of new scientific developments, publishing original research and review papers on such topics as:
Molecular sciences;
Breeding;
Physiology;
Pathology;
Nematology;
Virology;
Agronomy;
Engineering and Utilization.