Fertilizer responsiveness of high-yielding drought-tolerant rice in rainfed lowlands

Banayo, Niño P.M.C.; Rahon, Raymond E.; Cruz, Pompe Sta.; Kato, Yoichiro

doi:10.1080/1343943x.2020.1847668

Cited by 9 publications

(4 citation statements)

References 18 publications

(28 reference statements)

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“…Taking that into consideration, reproductive tiller per unit area is a crucially significant morpho-physiological character of paddies that is considered to be a high N content indicator in cultivated soil [46,47]. Furthermore, the spike-bearing numbers/unit area, filled grains number and spike weights are the main determining components for obtaining high grain quantities [48].…”

Section: Effect Of Azolla Compost Synthetic Fertilizers and Their Com...mentioning

confidence: 99%

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

et al. 2022

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The excessive application of synthetic fertilizers can result in severe environmental risks, while composting green and fresh feedstocks can provide slow-release nutrients. Therefore, the aim of the current investigation was to study the effects of eight individual and combination treatments of azolla compost and NPK synthetic fertilizers (control = no fertilizer and compost; 100% NPK = full recommended dose of synthetic fertilizers as follows: 165 kg N/ha−1, 37 kg P2O5/ha−1 and 50 kg K2O/ha−1; 70% NPK; 40% NPK; 100% azolla compost (5 t DM ha−1); 50% NPK + 50% azolla compost; 70% NPK + 30% azolla compost and 40% NPK + 60% azolla compost) on rice growth, productivity and nutrient uptake in semi-arid agro-ecosystems. The results indicated that the combination of 40% NPK + 60% azolla compost or 50% NPK + 50% azolla compost resulted in the most optimal growth and the highest yield components. In addition, the application of 40% NPK + 60% azolla compost exhibited similar rice grain yields (10.76 t ha−1) as well as N, P, and K content and uptake compared with the full recommended dose of NPK fertilizer (100% NPK). This study declared that the utilization of azolla compost as an individual or combination application can reduce usage of synthetic fertilizers by up to 60% without significant reduction in the growth and grain productivity of rice.

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Section: Effect Of Azolla Compost Synthetic Fertilizers and Their Com...mentioning

confidence: 99%

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

et al. 2022

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“…This was the case under rainfed conditions in Magoola 2017 and Idete in 2016, where yields were low due to poor grain filling, and the resultant harvest indices were lower than those observed in similar treatments under adequate water supply. The minimal effect of fertiliser application observed in this study due to drought relates with previous studies where limited fertilisation effect and low rice yields have been reported as a result of drought at panicle initiation, flowering or grain filling stage (Banayo et al, 2020;Castillo et al, 2006;Yang et al 2019). Drought during our study occurred from panicle initiation to grain filling stage in Magoola 2017, and at vegetative, panicle initiation and grain-filling stage in Idete 2016 (Supplementary Table S2.3).…”

Section: Discussionsupporting

confidence: 81%

Increasing smallholder rice production in East Africa : Fertilisers or good agronomic practices?

Awio

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Meeting the demand for staple food crops, especially cereals, is one of the challenges sub-Saharan Africa (SSA) continues to grapple with. Low crop productivity in SSA is the main contributor to the inability to meet the food demand. Increasing crop productivity in smallholder farming systems, hence closing the gap between potential and actual farm yields, is needed to meet the food demand on existing arable land. In order to address the low soil fertility that limits crop productivity, farmers apply NPK fertilisers. Yet, fertilisation with only NPK is not always resulting in better yields on farmers' fields. Crop responses to NPK fertilisation can be influenced by other nutrients, recommended agronomic practices (RAP) and inherent soil fertility. However, there is little attention to secondary and micro-nutrient fertiliser use by smallholder farmers, while farmers' application of RAP tends to be sub-optimal. Also, variation in inherent soil fertility level exists among farmers' fields because of crop management differences.Improved understanding of the role of secondary and micro-nutrients, RAP, and inherent soil fertility is therefore required to design management packages to enhance grain yield and NPK use efficiency. The aim of this thesis is to quantify for lowland rice the effect of secondary and micro-nutrients, RAP under researcher supervision and as applied by farmers, and inherent fertility on rice yield and NPK use efficiency, and to identify feasible options to improve productivity.Researcher-and farmer-managed joint on-farm experiments were conducted under irrigated and rainfed lowland conditions in Tanzania and Uganda. For the researchermanaged on-farm trials conducted between 2015 and 2017, treatments tested included RAP combined with: zero fertilisation as a control, NPK fertilisation with and without secondary and micro-nutrients (S, Mg, B, Cu, Mn, Zn), and/or treatments where B, Mn and Zn were omitted one at a time from the NPK + secondary and micro-nutrient treatment. Treatments for the joint on-farm trials conducted in 114 farmers' fields in Uganda in 2019 included farmers' practice (FP) as a control, RAP with and without NPK, and farmer-selected best practices geared towards intensification (farmers' intensification practice, FIP). One year after the joint on-farm trials, a follow-up evaluation study using a semi-structured questionnaire and field observations was conducted. For the researcher-and farmer-managed joint trials, data were collected on grain yield and yield components. Plant sample analyses were also made for the joint on-farm trials to determine N, P and K tissue concentrations. While data on socio-Abstract viii economic, crop management practices and grain yield were collected during the followup evaluation study.Grain yield improved due to NPK fertilisation by ca. 32 and 29% in Tanzania during 2015 and 2016, and by 24 and 100% in Uganda during 2016 and 2017, respectively. Applying NPK + secondary and micro-nutrients further increased grain yield in Tanzania by 7 and 11% during...

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“…The DT check variety, NSIC Rc192, obtained a grain yield of 1.78-6.33 t ha −1 under rainfed conditions and 0.98-4.21 t ha −1 under controlled-drought conditions with an average of 4.32 and 2.18 t ha −1 , respectively. The average grain yield in the rainfed conditions was relatively higher than those observed in other studies, 3.63 t ha −1 in other regions in the Philippines [40,41] and 3.50 t ha −1 in Nepal [42,43]. The grain yields for the DT check variety were reduced by 8-67% and 47-88% under the rainfed and controlled-drought conditions, respectively, relative to the irrigated control.…”

Section: Grain Yieldmentioning

confidence: 57%

Specialty Rice (Oryza sativa L.) with High and Stable Grain Yield under Rainfed Lowland Conditions

Agustin,

Ordonio,

Natividad

et al. 2023

Agriculture

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This study aimed to identify superior genotypes of specialty rice (SR) with comparable or higher grain yield than the drought-tolerant check variety under rainfed and controlled-drought conditions. A total of 17 SR varieties (six aromatic, six pigmented, five glutinous) and a drought-tolerant check variety with ordinary grain quality were evaluated under rainfed lowland and controlled-drought conditions from 2019 to 2021 at Central Luzon State University in the Philippines. Among the SR varieties, aromatic NSIC Rc344, pigmented Black rice, and glutinous NSIC Rc15 had comparable or higher grain yield than the drought-tolerant check variety under both rainfed and controlled-drought conditions. These selected genotypes were classified as the highest yielding, with a more stable yield than the drought-tolerant check variety across the hydrological conditions based on the BLUPs productivity and stability test and drought tolerance indices. The selected SR varieties had a greater panicle number (NSIC Rc344), more grains per panicle (NSIC Rc15), and a higher 1000-grain weight and harvest index (Black rice). In comparison to a higher yield but with a higher market price due to the superior grain quality of the identified SR than the drought-tolerant check variety, the net income in rainfed lowland conditions significantly increased by 69–108%. These results suggest that planting good-performing SR in rainfed lowlands can increase profitability in this ecosystem due to the higher market price compared to ordinary drought-tolerant varieties.

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Fertilizer responsiveness of high-yielding drought-tolerant rice in rainfed lowlands

Cited by 9 publications

References 18 publications

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

Increasing smallholder rice production in East Africa : Fertilisers or good agronomic practices?

Specialty Rice (Oryza sativa L.) with High and Stable Grain Yield under Rainfed Lowland Conditions

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