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Nitrogen Release Rate Differs by Fertilizer Source

机译：肥料来源的氮释放速率不同

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Controlled-release fertilizers allow growers to reduce leachate nitrogen loss and better manage crop nutrition in comparison to water-soluble fertilizers. Nitrogen leaching and plant growth were evaluated in a container production system using a granular water-soluble (GWS) ammonium nitrate fertilizer (34-0-0), a controlled-release fertilizer (CRF) (18N-6P-12K), and a non-fertilized control (NFC). Selected plant species were grown for ten weeks using 1,485 g N per cubic meter (2.5 pounds N per cubicyard) CRF or the GWS fertilizer. Leachate pH was higher (7,0+) for the GWS and NFC treatments than the CRF (6.5 to 7.0). Total soluble salts in the leachates reflected the initial leaching of salts from the substrate, with a continued decrease in solublesalts for the GWS fertilizer and NFC treatments. With the CRF, soluble salts decreased slightly during the first five weeks, but then increased over the next five weeks. The CRF provided acceptable ammonium levels for production purposes throughout theten-week period, while the GWS fertilizer and NFC treatments both showed progressive decreases in ammonium levels throughout the ten-week period, becoming inadequate for production. Nitrate levels varied during the ten-week period, with levels decliningto insufficient amounts with the GWS fertilizer and NFC treatments, while the levels for the CRF were suitable for production throughout the study. Growth indices, fresh matter weights, and dry matter weights were higher with the CRF than with both the GWS fertilizer and NFC treatments.
机译：与水溶性肥料相比，控释肥料可使种植者减少渗滤液氮的损失并更好地管理作物营养。在容器生产系统中使用颗粒状水溶性（GWS）硝酸铵肥料（34-0-0），控释肥料（CRF）（18N-6P-12K）和氮肥在容器生产系统中评估了氮的淋失和植物生长非受精对照（NFC）。使用每立方米1,485 g N（每立方英亩2.5磅N）的CRF或GWS肥料，使选定的植物物种生长十周。 GWS和NFC处理的渗滤液pH值高于CRF（6.5至7.0）（7.0 +）。渗滤液中的总可溶性盐反映了盐从基质中的最初浸出，而GWS肥料和NFC处理的可溶性盐含量持续下降。使用CRF，可溶盐在前五周内略有下降，但在接下来的五周内上升。 CRF在整个十周期间为生产目的提供了可接受的铵水平，而GWS肥料和NFC处理均显示在整个十周期间铵水平逐渐下降，变得不足以用于生产。硝酸盐水平在十周内变化，使用GWS肥料和NFC处理后，硝酸盐水平下降到不足量，而整个研究中CRF的水平都适合生产。 CRF的生长指数，新鲜物质重量和干物质重量均高于GWS肥料和NFC处理。

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