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首页> 外文学位 >Nitrogen uptake and leaching potential of polymer coated nitrogen fertilizers in a turfgrass environment.
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Nitrogen uptake and leaching potential of polymer coated nitrogen fertilizers in a turfgrass environment.

机译：草坪环境中聚合物包膜的氮肥的氮吸收和淋溶潜能。

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摘要

Establishing and maintaining quality turfgrass requires nitrogen (N) fertilization. However, potential leaching losses of N present environmental and economic concerns. Nitrogen losses deprive turfgrass of an essential nutrient and serve as a potential pollutant to surface and ground waters. Studies were conducted to investigate the effect of polymer-coated (NH{dollar}rm sb4)sb2SOsb4{dollar} (AS), urea, and KNO{dollar}sb3{dollar}, with varied coating thicknesses and sizes, on uptake and leaching of applied N to bermudagrass (Cynodon dactylon) grown on sandy soil and the factors effecting the N release.; A laboratory study was conducted to investigate the effect of temperature, coating thickness, and N substrate on the release of N from the encapsulated fertilizers into deionized H{dollar}sb2{dollar}O. An increase in temperature from 25{dollar}spcirc{dollar}C to 35{dollar}spcirc{dollar}C increased N released from 30% to 56% for coated AS with 4.7% coating (CAS-4.7), and from 70% to 78% for coated urea with 4.8% coating (CUrea-4.8). Data suggest a differential increase in solubility of the N substrates. Increases in coating thickness reduced N release differently, depending on N substrate and granule size.; In a field study, using open-ended lysimeters equipped with multi-depth samplers, the N uptake and leaching of uncoated and polymer-coated {dollar}sp{lcub}15{rcub}{dollar}N AS and urea applied to bermudagrass growing on sandy soil were determined. Nitrogen uptake recovery using an {dollar}sp{lcub}15{rcub}{dollar}N tracer method and a difference method increased as a result of coating, except for CAS-9.8. Coated Urea-10 produced the highest N uptake, followed by CUrea-4.8 and CAS-4.7 Nitrate-N concentrations in the intermediate vadose zone (IVZ) at the 30 cm depth, and the saturated zone at 90 and 120 cm, were affected by applied N, coating and coating thickness.; In another lysimeter study, the N sources were applied to lysimeters packed with a sand-based golf green profile. Nitrogen uptake and N leached to the 46 cm depth were determined. Nitrogen uptake ranged from 26% (KNO{dollar}sb3{dollar}) to 69% (CAS-7.5). Nitrogen leached from the CAS and CUrea treatments ranged from 0.3% (CAS-15) to 7.7% (CAS-7.5) of applied N.; This study documents the effectiveness of the polymercoated N sources in minimizing N leaching and increasing N uptake in a turfgrass environment.
机译：建立和维持优质草皮草需要氮肥。但是，潜在的N浸出损失带来了环境和经济问题。氮损失使草皮草失去了必需的养分，并成为地表水和地下水的潜在污染物。进行了研究以调查具有不同涂层厚度和大小的聚合物涂层（NH {dollar} rm sb4）sb2SOsb4 {dollar}（AS），尿素和KNO {dollarssb3 {dollar}对吸收和浸出的影响施氮对在沙质土壤上生长的百慕大草（Cynodon dactylon）的影响以及影响氮释放的因素。进行了一项实验室研究，以研究温度，涂层厚度和N基质对N从包封的肥料释放到去离子H {dollar} sb2 {dollar} O中的影响。温度从25 {spC上升到35spspC时，氮的释放量从含4.7％涂层（CAS-4.7）的涂层AS的30％增加到56％，从70％涂层脲含量为4.8％（CUrea-4.8）时，最高可达78％。数据表明，N底物的溶解度有所不同。涂层厚度的增加使氮的释放有所不同，这取决于氮底物和颗粒的大小。在野外研究中，使用配备多深度采样器的开放式溶渗仪，将未包被的和聚合物包被的{dol} sp {lcub} 15 {rcub} {dollar} N AS和尿素的氮吸收和浸出应用于百慕大草的生长确定在沙质土壤上。除CAS-9.8外，使用包衣的结果增加了使用{sp} lc {lcub} 15 {rcub} {dollar} N示踪剂法和差异法的氮吸收回收率。涂覆的尿素10吸收的N最高，其次是在30 cm深度的中间渗流区（IVZ）中的CUrea-4.8和CAS-4.7硝酸盐-N浓度受到影响，饱和区90和120 cm受施氮，涂层和涂层厚度。在另一个溶渗仪研究中，将N源应用于装有沙子型高尔夫球果岭轮廓的溶渗仪。确定氮吸收和氮浸出至46 cm深度。氮的吸收范围从26％（KNO {s}} {sb3 {dol}}到69％（CAS-7.5）。从CAS和CUrea处理中浸出的氮量为施氮量的0.3％（CAS-15）至7.7％（CAS-7.5）。这项研究记录了在草皮环境中，聚合物包衣的氮源在减少氮淋失和增加氮吸收方面的有效性。

著录项

  • 作者

    Varshovi, Amir A.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Agriculture Agronomy.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 206 p.
  • 总页数 206
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

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