F. Ferrera, J. Villar, C. Stöckle, P. Villar, M. Aran
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引用次数: 13
摘要
本研究在不同农田进行了为期2年的氮素响应试验，以监测土壤NO3-N剖面、作物的氮素积累和作物的最终生产性能，以评估预侧植土壤NO3-N (Pre-Sidedress soil Nitrate Test, PSNT)是否可作为d 'Urgell运河(西班牙Lleida)灌区玉米土壤氮素有效性的可靠指标。以及该试验是否可以用来区分有反应的田地和无反应的田地，以辅助氮肥的施用。初步土壤氮素有效性(氮肥侧施率+ PSNT)临界值分别为300 kg NO3-N·hm - 1和210 kg NO3-N·hm - 1，用于确定需要补施氮肥的田地(产量目标为14 t粒·hm - 1)。
Use of a pre-sidedress soil nitrate test (PSNT) to determine nitrogen fertilizer requirements for irrigated corn
In the present study, a 2-year N rate response experiment was conducted in different fields to monitor NO3-N soil profiles, N accumulation by the crop and final crop performance, in order to assess if soil NO3-N at pre-sidedressing (Pre-Sidedress Soil Nitrate Test,
PSNT) is a reliable indicator for soil N availability for corn in the irrigated area served by canal d’Urgell (Lleida, Spain), and if the test can be used to separate responsive fields from non-responsive fields to sidedress N fertilizer applications. Preliminary soil N availability (N sidedress
fertilizer rate + PSNT) critical levels to identify fields that need supplementary N fertilizer applications were established at ca. 300 and 210 kg NO3-N·ha–1, for PSNTrooting–zone and PSNT0–30 cm, respectively (for a yield goal of 14 t grain·ha–1).
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