Lowland rice yield and profit response to fertilizer application in Rwanda

Nabahungu, Nsharwasi Léon; Cyamweshi, Athanase R.; Kayumba, John; Kokou, Kouami; Mukuralinda, Athanase; Cirhuza, Jackson M.; Wortmann, Charles S.

doi:10.1002/agj2.20006

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The results indicated the importance of nutrients availability in soil to support the yield component of lowland rice. As reported by [20] that the sufficient nutrients were required such as N, P and K to increase rice yield. As mentioned by [7] that the agronomic nitrogen increased along with the application of Nitrogen up to 120 kg/ha.…”

Section: Yield Component and Yieldmentioning

confidence: 87%

Growth and yield of three high-yielding varieties of lowland rice as affected by application of inorganic fertilizers

Suleman,

Hadini,

Raharjo

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The need for rice in Indonesia currently increases linearly along with the soaring of population. However, the rice production tends to be levelling-off. This study evaluates the yield potential of three lowland rice varieties under different rate of fertilizer. The varieties of Mekongga, Ciherang and Inpari30 sub1 were grown under five fertilizer treatments: 90 %, 100 % served as a control, 110 %, 115 %, and 120 % of recommended rate with three replications and laid out in a factorial block design. The study was located on a silty loam and irrigated soil. ANOVA was applied and followed by a Tukey test at a 5 % level. Among three varieties, Mekongga and Inpari-30 sub1 produced more yield than Ciherang by 6.71 and 6.77 t ha−1, respectively. Increasing the rate of fertilizers caused the increase of the yield significantly. The highest grain yield was recorded by the application of 120 % of recommended rate by 7.82 t ha−1. Fertilizer rate was positively correlated with grain yield (r=0.97). The result shows the importance of cropping system pattern in order to prevent the soaring of harmful attacks of pest and disease as well as the evaluation of fertilizer recommendation that had been used a dozen consecutive years.

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Section: Yield Component and Yieldmentioning

confidence: 87%

Growth and yield of three high-yielding varieties of lowland rice as affected by application of inorganic fertilizers

Suleman,

Hadini,

Raharjo

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Application of secondary and micronutrients was not considered in this analysis due to data scarcity. Once soil N, P, and K are adequately available, response to some other nutrients will often occur, although often with less PCR compared with N, P, and K (Cyamweshi et al., 2017; Kihara et al., 2017; Nabahungu et al., 2020; Wortmann et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

Nutrient management for sustainable food crop intensification in African tropical savannas

Wortmann

Stewart

2021

Agronomy Journal

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Increased fertilizer use is often an essential component of sustainable intensification for improved food security and economic growth in the upper elevation tropical savanna (UTS) and lower elevation tropical savanna (LTS) of Africa. The UTS and LTS are large "breadbasket" areas with little fertilizer use due to financial and other constraints. Farmers' perceptions of high profit opportunity with low risk are often major drivers of adoption. Representative crop nutrient response functions are needed to maximize farm-level profits from fertilizer use. Such functions were determined from results of past research, and profit potentials were evaluated. The mean yield increases due to fertilizer application at the economically optimum rate, relative to yield with no fertilizer applied, were as follows: 41% for cassava (Manihot esculenta Crantz), 18% for cowpea [Vigna unguiculata (L.) Walp.], 16% for groundnut (Arachis hypogaea L.), 67% for maize (Zea mays L.), 50% for lowland rice (Oryza sativa L.), and 39% for sorghum [Sorghum bicolor (L.) Moench] in LTS, and 46% for bean (Phaseolus vulgaris L.), 81% for groundnut, 58% for maize, 96% for upland rice (Oryza sativa L. or Oryza glaberrima Steud.), 32% for sorghum, and 48% for soybean [Glycine max (L.) Merr.] in UTS. The profit potential varied greatly across nutrient rates applied to individual crops making optimized crop-nutrient-rate choices especially important for cases of financially constrained fertilizer use. Considerations for achieving widespread adoption of increased fertilizer use are discussed. Increased fertilizer use needs to be complemented by mitigation of diverse yield and socioeconomic constraints to meet the growing demand for food.

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“…Experiments were established in nine marshlands in Rwanda during February to June 2016 season and September 2016 to February 2017 seasons, referred to in Rwanda as the 2016B and 2017A seasons, respectively (Nabahungu et al., 2020). The marshlands are in Eastern province (Muvumba, Cyabayaga, Kanyonyomba, Cyaruhogo, and Cyunuzi), Southern province (Rwasave, Rugeramigozi, and Mukunguri), and Western province (Bugarama) in Rwanda (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Urea briquettes combined with a fertilizer blend reduces fertilizer costs and improves yields of irrigated rice in Rwanda

et al. 2023

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We evaluated the yield and potential economic impact in Rwanda of replacing the standard lowland rice (Oryza sativa L.) fertilizer recommendation from the current practice of 200 kg NPK 17-17-17 ha −1 and 100 kg urea ha −1 with a basal blend of 74 kg diammonium phosphate (DAP), 57 kg potassium chloride (KCl), and deep placement of 112.5 kg urea briquettes ha −1 at 4 weeks after transplanting. Experiments were carried out in nine diverse marshlands across Rwanda in the long and short rainy seasons of 2016, with the two fertilizer treatments and a no-fertilizer control. Compared to the current practice, the urea deep placement (UDP) package increased yields by 1.08 and 0.84 mt ha −1 in the respective seasons, while at the same time lowering N fertilizer rate by 15 kg ha −1 . Average value to cost ratio increased from 1.89 (current recommendation) to 3.16 (UDP recommendation) and would be still greater than 2.0 at six times increase in labor cost. The cost of fertilizer recommendation (fertilizer cost plus application cost) was lower with the UDP package due to replacing 17-17-17 with a lower rate of the DAP and KCl combination. The overall average net benefit of US$300 ha −1 was substantial.

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Lowland rice yield and profit response to fertilizer application in Rwanda

Cited by 5 publications

References 22 publications

Growth and yield of three high-yielding varieties of lowland rice as affected by application of inorganic fertilizers

Growth and yield of three high-yielding varieties of lowland rice as affected by application of inorganic fertilizers

Nutrient management for sustainable food crop intensification in African tropical savannas

Urea briquettes combined with a fertilizer blend reduces fertilizer costs and improves yields of irrigated rice in Rwanda

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