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首页> 外文期刊>Animal Production Science >Effect of high rates of potassium chloride fertiliser on banana leaf conductance, plant growth, nutrient concentration and root death under contrasting watering regimes
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Effect of high rates of potassium chloride fertiliser on banana leaf conductance, plant growth, nutrient concentration and root death under contrasting watering regimes

机译：在不同灌溉方式下高氯化钾肥对香蕉叶片电导率，植物生长，养分浓度和根系死亡的影响

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摘要

Weak root systems, which predispose banana plants with a bunch to topple, are common in the Australian subtropical banana industry. Many banana growers consider the problem could be associated with the use of potassium chloride (KCl) fertiliser under dry soil conditions. We assessed the effect of high rates of KCl on banana leaf abaxial conductance (gab), plant growth including root weights, and whole plant nutrient concentration under a range of watering regimes using banana plants growing in troughs of soil in a glasshouse. The trial factorially combined watering after 15 (W1), 30 (W2), 60 (W3) and 120 (W4) mm evaporation from nearby bins with 4 rates of KCl—78 (T1), 376 (T2), 617 (T3) and 796 (T4) g/m2.nnAt the end of the trial exchangeable potassium on the T4 treatment was 5.8 cmol(+)/kg with 31% of this in the soil solution. A substantial proportion of exchangeable calcium, magnesium and sodium were also displaced into the soil solution. Banana leaf abaxial conductance peaked at 2–2.5 cm/s on the T1 W1 treatment combination, but decreased as soil matric potential decreased or KCl rate increased. The linear relationship for effect of KCl rate on gab indicated that gab was reduced by an average of 80% on the T4 treatment across a wide range of matric potentials. Increasing KCl and withholding irrigation generally had similar effects on the concentration of nutrient elements in the plant. The high concentration of KCl in the soil did not appear to interfere with plant uptake of calcium and magnesium.nnPlant size was reduced 42% on the T4 treatment, but at harvest most plant components were reduced more by infrequent watering than by the highest KCl rate.nnDead root weight as a percentage of total root weight ranged from <30% for combinations of T1 or T2 with W1 or W2 to >50% for other treatment combinations. It was concluded that the interaction of dry soil conditions and reasonable fertiliser application rates was unlikely to contribute greatly to the death of banana roots in the field.
机译：弱根系统使香蕉植株易倾倒，在澳大利亚亚热带香蕉产业中很常见。许多香蕉种植者认为，该问题可能与在干燥土壤条件下使用氯化钾（KCl）肥料有关。我们使用生长在温室土壤槽中的香蕉植物，在一系列灌溉制度下，评估了高浓度的氯化钾对香蕉叶背面传导（gab），植物生长（包括根重）和全植物养分浓度的影响。在从附近垃圾箱中蒸发15（W1），30（W2），60（W3）和120（W4）mm后，采用4倍KCl-78（T1），376（T2），617（T3）速率进行因子分解联合浇水试验和796（T4）g / m2.nn。试验结束时，T4处理中可交换钾为5.8 cmol（+）/ kg，其中31％在土壤溶液中。大部分可交换的钙，镁和钠也被置换到土壤溶液中。在T1 W1处理组合上，香蕉叶背面电导在2–2.5 cm / s处达到峰值，但随着土壤基质电位降低或KCl速率增加而降低。 KCl速率对gab影响的线性关系表明，在广泛的基质潜能范围内，T4处理的gab平均降低了80％。增加氯化钾和不灌溉对植物中营养元素的浓度通常具有相似的影响。土壤中高浓度的KCl似乎并未干扰植物吸收钙和镁.nn在T4处理中，植物的大小减少了42％，但收获时大多数植物成分的减少量比最高的KCl率减少得更多.nn死根重占总根重的百分比范围从T1或T2与W1或W2的组合的<30％到其他处理组合的> 50％。结论是，旱地条件和合理的肥料施用量之间的相互作用不太可能对田间香蕉根的死亡有很大贡献。

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  • 来源
    《Animal Production Science》 |1999年第2期|p.211-219|共9页
  • 作者

    G. G. Johns and I. A. Vimpany;

  • 作者单位

    A NSW Agriculture, PO Box 72, Alstonville, NSW 2477, Australia.B Present address: 302 Cowlong Road, McLeans Ridges via Lismore, NSW 2480, Australia.C Author for correspondence;

    e-mail: geoff.johns@agric.nsw.gov.au;

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