Abstract
Depletion of soil nutrients due to continuous cultivation without adequate external fertilization is one of the challenges facing many smallholder farmers in western Kenya. This study was conducted to assess the effects of organic (water hyacinth compost), inorganic (urea) nitrogen (N) sources, and commercial Rhizobia inoculant on the yield of common bean (Phaseolus vulgaris) for two consecutive seasons in the short rains (2013) and long rains (2014). The experiments were laid out in a randomized complete block design and replicated four times. Triple superphosphate was applied to all treatments except those with compost to ensure that the soil had adequate phosphorus (P). Yellow and Rose coco bean varieties grown with urea and inoculated with commercial Rhizobia inoculant gave significantly higher yield of 382 kg ha−1 and 341 kg ha−1, respectively in the short rains (SR) season. In the long rains (LR) season bean yield was high in water hyacinth compost (1526 kg ha−1) and control with non-limiting P (1300 kg ha−1) treatments. Commercial Rhizobia inoculant did not significantly increase in yield in the SR and LR seasons. There was no significant influence on soil properties after two seasons of continuous cultivation of common bean and application of organic and inorganic fertilizers. These results demonstrate that water hyacinth compost improved bean yield in the LR season. However, longer field testing and economic analysis are required for it to be recommended as a substitute for inorganic N source among smallholder farmers.
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Claims 8
Claim · model-written summary
Yellow bean with urea yielded 382 kg ha−1 in the short rains, significantly higher.
Not reportedComparator
Verbatim
e0“Yellow and Rose coco bean varieties grown with urea and inoculated with commercial Rhizobia inoculant gave significantly higher yield of 382 kg ha−1 and 341 kg ha−1, respectively in the short rains (SR) season.”
Claim · model-written summary
Rose coco bean with Rhizobia yielded 341 kg ha−1 in the short rains, significantly higher.
- Taxon
- beane0
- Material
- Rose cocoe0
- Treatment
- inoculated with commercial Rhizobia inoculante0
- Interactor
- Rhizobiae0symbiont
- Outcome
- yielde0
- Direction
- highere0
- Value
- 341 kg ha−1e0
Not reportedComparator
Verbatim
e0“Yellow and Rose coco bean varieties grown with urea and inoculated with commercial Rhizobia inoculant gave significantly higher yield of 382 kg ha−1 and 341 kg ha−1, respectively in the short rains (SR) season.”
Claim · model-written summary
Bean yield with water hyacinth compost was 1526 kg ha−1 in long rains.
Verbatim
e0“bean yield was high in water hyacinth compost (1526 kg ha−1)”
Claim · model-written summary
Bean yield in the non-limiting phosphorus control was 1300 kg ha−1 in long rains.
Verbatim
e0“control with non-limiting P (1300 kg ha−1) treatments”
t0“bean”
Claim · model-written summary
Rhizobia inoculant did not significantly increase bean yield in either season.
- Taxon
- beant0
- Treatment
- Commercial Rhizobia inoculante0
- Interactor
- Rhizobiae0symbiont
- Outcome
- Commercial Rhizobia inoculant did not significantly increase in yield in the SR and LR seasons.e0
- Direction
- did not significantly increasee0
Not reportedComparator
Verbatim
e0“Commercial Rhizobia inoculant did not significantly increase in yield in the SR and LR seasons.”
t0“bean”
Claim · model-written summary
Two seasons of bean cultivation and fertilizers had no significant influence on soil properties.
- Taxon
- common bean
Phaseolus vulgarise0 - Treatment
- application of organic and inorganic fertilizerse0
- Outcome
- soil propertiese0
- Direction
- no significant influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant influence on soil properties after two seasons of continuous cultivation of common bean and application of organic and inorganic fertilizers.”
Claim · model-written summary
Water hyacinth compost improved bean yield in the long rains.
Not reportedComparator
Verbatim
e0“water hyacinth compost improved bean yield in the LR season.”
Claim · model-written summary
Longer field testing and economic analysis are required before recommending compost as an inorganic nitrogen substitute.
Verbatim
e0“longer field testing and economic analysis are required for it to be recommended as a substitute for inorganic N source among smallholder farmers.”
t0“common bean”
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