Ratios of Nutrients in Lowland Rice Grown on Two Iron Toxic Soils in Nigeria

Olaleye, A. O.; Ogunkunle, A. O.; Singh, B. N.; Akinbola, G. E.; Tabi, Fritz Oben; Fayinminu, O. O.; Iji, M. E.

doi:10.1080/01904160903006036

Cited by 13 publications

(19 citation statements)

References 14 publications

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“…While iron (Fe) content was above the critical levels for the occurrence of mineral toxicity (> 300 ppm) in 51% of the samples, iron toxicity symptoms were not observed in our trials in either of the seasons. Given the existing genetic variation in iron toxicity tolerance across lowland rice varieties (Becker and Asch 2005;Olaleye et al 2009), this could possibly be explained by a certain degree of tolerance in the rice varieties used here, reducing or masking symptoms of iron toxicity. Similarly, high concentrations of Ca were found in Kilombero soils, with an average Ca content of 1200 ppm (Table 3).…”

Section: Soil Fertility Statusmentioning

confidence: 99%

Increasing paddy yields and improving farm management: results from participatory experiments with good agricultural practices (GAP) in Tanzania

Senthilkumar¹,

Tesha²,

Mghase³

et al. 2018

Paddy Water Environ

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Rice is an increasingly important commodity in sub-Saharan Africa. In Tanzania, the rice yield gap is as high as 87%, due to a combination of production constraints and sub-optimal crop management. Reducing this yield gap may be partly achieved through the introduction and dissemination of good agricultural practices (GAP). We conducted 18 farmer-managed onfarm trials in Tanzania, to test a set of GAP components against conventional farmers' practices (FP) for two consecutive growing seasons in 2013 and 2014. The objectives were: (1) to understand farmers' capabilities in implementing GAP; (2) to acquire better insights into the merits, relevance and suitability of individual GAP components; and (3) to provide a case study showing that exposure to good practices combined with the farmers' own experimentations can serve to improve and, trigger a positive change in the participating farmers' crop management. Compared to the farmers' own practices, average yield increases of 1 t paddy ha −1 in 2013 and 2.7 t ha −1 in 2014 were achieved when following GAP. These yield advantages were mainly obtained by a higher panicle number, improved harvest index and improved weed control. Farmers experienced difficulties with land levelling, planting or sowing in lines and using rotary weeders, but they were convinced that these technologies are important to boost their rice yields. The case of Tanzania shows that paddy yields can be substantially improved by GAP and that adoption of GAP by smallholder rice farmers can be triggered by stimulating experimentations with such practices on their own farms.

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Section: Soil Fertility Statusmentioning

confidence: 99%

Increasing paddy yields and improving farm management: results from participatory experiments with good agricultural practices (GAP) in Tanzania

Senthilkumar¹,

Tesha²,

Mghase³

et al. 2018

Paddy Water Environ

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“…However, under Fe severe toxicity condition susceptible genotypes are adversely affected. When iron toxicity occurs during the late vegetative or early reproductive growth phases is associated with reduction in panicle number per plant [33].…”

Section: Performance Of Post-harvest Traits Of the Tested Genotypesmentioning

confidence: 99%

Effects of Iron on the Productivity of Lowland Rice (O. sativa L.) in Segregating Populations

Andrew¹,

Dorcas²,

Olawale³

2020

AJAF

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Rice plants have the tendency of taking up iron in the form of Fe 2+ , which is prevalent in paddy fields under flooded environments. But its deficiency or in excess of Fe 2+ in the soil affect several physiological functions of the plant. The objective of the study was to evaluates the effect of three ferrous sulphate concentration levels on the yield and yield components of lowland segregating rice populations. Three experiments were established in screenhouse concurrently in randomized complete block design in three replications in pots. Treatment comprised of 6 breeding lines each from two rice populations of F2 and F3 generations and two popular checks. Experiment one is the control without FeSO 4 treatment, while experiment two and three are F2 and F3 populations, respectively treated with FeSO 4 solution. Three concentration levels of FeSO 4 solution (600mg/kg of soil, 1200mg/kg of soil, and 1800mg/kg of soil,) were applied into each pots a week before transplanting in the treated experiments. Remarkable reduction in effective tiller number at 1800mg of Fe stress relative to the control was observed of 42.6% and 42.9% in F2 and F3 population, respectively. Significant reduction in grain yield of 33.5% and 36.4% at 1800mg of Fe compared to the control in F2 and F3 populations, respectively. The study showed that at 1200mg of Fe could be optimal for rice crop performance and at 1800mg of Fe becomes toxic to the plant as observed significant reduction in all agronomic traits especially in total grain yield. In F2 and F3 population, UPN 59, UPIA 2 and UPN 95 where the most stable genotypes across iron concentration levels. These genotypes could be used in population development for iron breeding programme.

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“…Ratios of nutrients in plant tissues have been widely used by many researchers in diagnosing mineral nutrient imbalances in crops ( Sumner, 1978 ). Among the commonly encountered ratios in literature, K/Mg ratio is known for nutrient antagonism ( Olaleye et al, 2009 ). Moreover, K can be fixed in the interlayer spaces of 2:1 clay minerals (smectites) containing soils like Vertisols ( Brady and Weil, 2002 ) and the percentage increases with wetting and drying ( Pose et al, 1991 ).…”

Section: Resultsmentioning

confidence: 99%