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首页> 外文期刊>Soil Science Society of America Journal >Fertigation Frequency for Subsurface Drip-Irrigated Broccoli
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Fertigation Frequency for Subsurface Drip-Irrigated Broccoli

机译：地下滴灌西兰花的施肥频率

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Subsurface-drip irrigation and fertigation with fluid N fertilizer sources offers substantial flexibility for N fertilizer management. Fertigation events can be scheduled as often as irrigation, up to several times per day. However, because of system or management constraints very frequent fertigation may not be possible or desirable for some growers. Optimum fertigation interval for subsurface drip-irrigated crops has not been well researched. A 3-yr field experiment was conducted on a sandy loam soil in southern Arizona with subsurface drip-irrigated broccoli (Brassica olearacea L. Italica) to i) determine the effects of N rate and fertigation frequency on crop yield, quality, and crop N status, and ii) estimate a N balance. Broccoli was planted in two rows per raised bed 1.02 m apart, with one drip line buried 0.15 to 0.20 m deep within each bed. The experiment included factorial combinations of two N rates and four fertigation frequencies (intervals of 1, 7, 14, and 28 d). Broccoli marketable yield and quality were responsive to N rate, but not to increased fertigation frequency. During one of three seasons, fertigation frequency significantly (P 0.05) affected crop N uptake, but there was no trend of increasing N uptake with increasing fertigation frequency. Unaccounted fertilizer N and apparent N use efficiency (ANUE) were calculated for two seasons. Unaccounted fertilizer N averaged 20 and 75 kg ha-1 and ANUE 90 and 81% with 250 and 350 kg N ha-1 applied, respectively. Neither was significantly affected by fertigation frequency. We conclude, therefore, that for broccoli production with subsurface-drip irrigation on sandy loam or finer soils, fertigation can be applied as infrequently as monthly, without compromising crop yield or quality, or causing excessive N losses. </span> <span class=展开▼
机译：地下滴灌和液态氮肥施肥为氮肥管理提供了很大的灵活性。 施肥事件的安排可以与灌溉一样频繁， 每天最多几次。但是，由于系统或管理上的限制，某些种植者可能无法进行频繁的施肥或 。未对 地下滴灌作物的最佳施肥间隔进行研究。 在 的砂壤土上进行了3年的田间试验亚利桑那州南部的地下滴灌西兰花（Brassica olearacea L.Italica）到i）确定氮肥用量和施肥频率对作物产量，品质和作物氮的影响 状态，并且ii）估算N余额。在每张高起的床中，每隔1.02 m的 种植西兰花两行，每条床内埋有一条滴水线 0.15至0.20 m。实验包括两个N速率和四个施肥频率 （间隔1、7、14和28 d）的 因子组合。西兰花的可销售产量和品质对氮素含量有响应，但对施肥频率的提高没有响应。在三个季节之一中，施肥 的频率显着（P “有施肥次数没有增加氮素吸收的趋势 。计算了两个季节的未确认肥料氮素和表观氮利用效率（ANUE）。 > N平均分别施用20和75 kg ha -1 和ANUE 90％和81％，分别施用250和 350 kg N ha -1 。施肥频率对二者均无显着影响，因此我们得出结论，在砂质壤土或较细土壤上进行地下滴灌的西兰花生产，可以每月不频繁地 施肥，而不会损害作物的产量或质量，也不会导致 氮素过多损失。

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  • 来源
    《Soil Science Society of America Journal》 |2003年第3期|910-918|共9页
  • 作者

    Thomas L. Thompson; Scott A. White; James Walworth; Greg J. Sower;

  • 作者单位

    429 Shantz, Dep. of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721;

    429 Shantz, Dep. of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721;

    429 Shantz, Dep. of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721;

    429 Shantz, Dep. of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721;

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