4.4 Article

Comparative effect of different irrigation levels and soil amendments on cabbage productivity in semi-arid Central Namibia

Journal

IRRIGATION AND DRAINAGE
Volume -, Issue -, Pages -

Publisher

WILEY
DOI: 10.1002/ird.2906

Keywords

cabbage production; irrigation; sandy soils; soil amendments; Irrigation; Amendements du sol; Sols sableux; Production de chou

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In semi-arid Central Namibia, poor sandy soils limit sustainable crop production. We found that full irrigation and the use of biochar and other soil amendments can improve cabbage yield and quality, making them suitable for agricultural production in central Namibia.
In semi-arid Central Namibia, poor sandy soils limit sustainable crop production. We assessed cabbage performance in two split-plot field experiments. In Experiment 1, treatments comprised two irrigation levels: full irrigation (watered 3 days a week) and reduced irrigation (watered 2 days a week) as the main plot factor and six soil amendments (biochar; compost; zeolite; nitrogen, phosphorus potassium [NPK]; Be-Grow boost [L] hydrogel; and hoof and horn + bone [HHB] meal) as subplot factors in three replications. Full irrigation produced a significantly higher yield (21.1 t ha-1), head weight (0.958 kg) and larger head girths (42.1 cm). Biochar produced the highest marketable heads (24,884 heads ha-1), water use efficiency (76.0 kg ha-1 mm-1) and the largest head girths (42.7 cm). In Experiment 2, water was applied 5 and 4 days a week for full and reduced irrigation; the application rates of compost, HHB meal, Be-Grow boost (L) hydrogel and NPK were modified. The interaction of Be-Grow boost (L) hydrogel, NPK and biochar with full irrigation and HHB meal with reduced irrigation produced more marketable heads (28,935, 28,009, 27,546 and 28,703 heads ha-1, respectively). Therefore, full irrigation with these amendments could be used for resilient cabbage production in Central Namibia. Dans le centre semiaride de la Namibie, la pauvrete des sols sableux limite la production agricole durable. Nous avons evalue la performance du chou dans le cadre de deux experiences sur le terrain en parcelle divisee. Dans l'experience 1, les traitements comprenaient deux niveaux d'irrigation, arroses entierement trois jours par semaine et arroses de facon reduite deux jours par semaine comme facteur principal de parcelle et six amendements de sol (biochar, compost, zeolite, NPK, hydrogel de croissance (L), et sabot et corne + farine d'os (HHB)) comme facteurs de sous-parcelle en trois reutilisations. L'irrigation complete a produit un rendement nettement plus eleve (21,1 t ha-1), un poids de tete (0,958 kg) et une plus grande circonference de tete (42,1 cm). Le Biochar a produit les tetes commercialisables les plus elevees (24,884 tetes ha-1), l'efficacite de l'utilisation de l'eau (76,0 kg ha-1 mm-1) et la plus grande circonference de tete (42,7 cm). Dans l'experience 2, de l'eau a ete appliquee cinq et quatre jours par semaine pour une irrigation complete et reduite; Les taux d'application de compost, de farine HHB, d'hydrogel Be-Grow boost (L) et de NPK ont ete modifies. L'interaction entre l'hydrogel Be-Grow boost (L), le NPK et le biochar avec l'irrigation complete et la farine HHB avec l'irrigation reduite a produit plus de tetes commercialisables (28,935, 28,009, 27,546 et 28,703 tetes ha-1, respectivement). Par consequent, l'irrigation complete avec ces amendements pourrait etre utilisee pour la production resiliente de chou dans le centre de la Namibie.

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