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首页> 外文期刊>Agricultural Water Management >Effect of different fertilization and irrigation methods on nitrogen uptake, intercepted radiation and yield of okra (Abelmoschus esculentum L.) grown in the Keta Sand Spit of Southeast Ghana
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Effect of different fertilization and irrigation methods on nitrogen uptake, intercepted radiation and yield of okra (Abelmoschus esculentum L.) grown in the Keta Sand Spit of Southeast Ghana

机译：不同施肥和灌溉方式对加纳东南部凯塔沙坑中生长的秋葵（秋葵）氮吸收，截留辐射和产量的影响

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Three seasons' experiments were conducted in the Keta Sand Spit to test if current use of sprinkler irrigation and animal manure can be substituted by water saving drip fertigation with reduced P supply to okra. The treatments compared were: (i) irrigation by sprinkler, fertilized with manure spread, (ii) irrigation by sprinkler, fertilized with localized manure, (iii) irrigation by drip, fertilized with localized manure, (iv) irrigation by drip, fertigated with N-K chemical fertilizers (twice during the crop season in the first experiment, weekly in the second and third experiment). Nitrogen uptake, crop interception of solar radiation, yield and water productivity were compared among treatments. The crop did not respond well when fertigation was done only twice, probably due to N-leaching. However, in the second and third experiments, when fertigation was done weekly for eight weeks, the yield of drip fertigated okra was as high as or better than sprinkler irrigated okra with manure spread on the soil, sprinkler and drip with localized manure. In the second experiment, though nitrogen applied was the same (89 kg N ha(-1)), for all treatments, the highest N uptake, intercepted radiation and water productivity were obtained under drip fertigated treatment and these parameters were significantly (P = 0.05) higher than the other treatments. Under sprinkler irrigation, yield was higher with localized manure compared to manure evenly spread on the soil, even though the difference was not significant during the last season. The economic optimal crop N-uptake was estimated to be 125 kg ha(-1) independent of season and adequate N-supply seemed especially important for ensuring sufficient light interception during the fruiting stage of okra. Drip irrigation treatments saved almost 30% of water compared to sprinkler irrigation. Therefore, drip irrigation with frequent fertigation allow reduced P-load and more efficient use of nitrogen, water and radiation than with sprinkler irrigation. (C) 2014 Elsevier B.V. All rights reserved.
机译：在Keta Sand Spit中进行了三个季节的实验，以测试是否可以通过节水滴灌施肥来减少秋葵的磷供应，从而取代目前使用的喷灌和动物粪便。比较的处理方法是：（i）喷灌，撒施肥料，（ii）喷灌，撒施局部肥料，（iii）滴灌，撒施局部肥料，（iv）滴灌，施肥NK化学肥料（在第一个实验的农作物季节两次，在第二个和第三个实验的农作物季节每周两次）。比较了不同处理中的氮吸收，农作物对太阳辐射的截留，产量和水分生产率。当仅施肥两次时，农作物的反应不佳，这可能是由于氮淋失造成的。但是，在第二个和第三个实验中，当每周进行8周的施肥时，滴灌施肥的秋葵的产量与喷洒灌溉的秋葵一样高或更好，其中肥料撒在土壤上，洒水和局部施肥。在第二个实验中，尽管施氮量相同（89 kg N ha（-1）），但在所有处理中，滴灌施肥处理均获得最高的氮吸收，截留辐射和水生产率，这些参数均显着（P < = 0.05）高于其他治疗方法。在喷灌条件下，局部肥料的平均产量要比均匀分布在土壤上的肥料高，尽管上一季差异不大。经济最佳作物的氮素吸收量估计为125 kg ha（-1），与季节无关，充足的氮素供应对于确保秋葵果实期的充分采光尤为重要。与喷灌相比，滴灌处理节省了近30％的水。因此，与喷灌相比，频繁施肥的滴灌可以减少P负荷，并更有效地利用氮，水和辐射。 （C）2014 Elsevier B.V.保留所有权利。

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