Spatial variability of fertilizer management and response in rainfed rice of Nepal

Haefele, Stephan M.; Bhattachan, Birendra Kumar; Adhikari, Bikash; Abon, C.C.; Shresta, S.M.

doi:10.1016/j.agee.2014.03.041

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Alleviation of constraints to higher yield, other than nutrient deficiencies, is likely to increase response to applied nutrients at Longorola. Rice responded to N at the three upland rice locations agreeing with other results indicating that N deficiency is a common constraint to upland rice yield (Okonji et al, 2012;Haefele et al, 2014;Kaizzi et al, 2014;Niang et al, 2017) (Table 3). The mean responses for each location fitted the curvilinear to plateau function.…”

Section: Discussionsupporting

confidence: 89%

Rainfed rice response to fertilizer in the Sudan Savanna of West Africa

Sermé¹,

Dicko²,

Ouattara³

et al. 2018

Afr. J. Agric. Res.

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In West Africa, rice (Oryza sativa L. and Oryza glaberrimaI Steud) production is not meeting current demand. Low yields are attributed to diverse biotic and abiotic constraints including nutrient deficiencies, inadequate agronomic practices, and socioeconomic constraints. This study quantified yield and profit responses of rainfed rice produced in the Sudan Savanna of Burkina Faso and Mali to fertilizer N, P, K, and Mg-S-Zn-B treatment. The mean yields were 2.2 and 2.4 Mg ha-1 for upland rice in Finkolo and for lowland rice in Longorola in Mali, respectively, and 1.5 and 2.2 Mg ha-1 for upland rice at Boni and Karaba in Burkina Faso. Lowland rice grain yield was not affected by nutrient application at Longorola. The grain yield increases with 30 and 60 kg ha-1 N were, respectively, 0.30 and 0.48 Mg ha-1 at Karaba, 0.21 and 0.34 Mg ha-1 at Boni, and 0.32 and 0.41 Mg ha-1 at Finkolo indicating similarity in response. Grain yield response to P was observed only at Karaba. If fertilizer were applied at 50% rather than 100% of the economically optimum rate, as might be the case for financially constrained farmers, the mean yield increase was 36% less but agronomic efficiency was 23% higher and the profit cost ratio was 66% higher. There was no response to K or to Mg-S-Zn-B. The results, therefore, indicate high potential for profitable response of rainfed upland rice production for Sudan Savanna to fertilizer N but little potential for other fertilizer nutrients. These results should, however, be considered together with other field research results in making fertilizer use decisions.

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Section: Discussionsupporting

confidence: 89%

Rainfed rice response to fertilizer in the Sudan Savanna of West Africa

Sermé¹,

Dicko²,

Ouattara³

et al. 2018

Afr. J. Agric. Res.

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“…However, detailed on-farm studies evaluating the yield gap in rainfed lowland rice and determining the varieties contributing to the yield gap in the mid-hills of Nepal are rare. A recent study by Haefele et al (2014) indicated that grain yields in the Mid-hills vary considerably between different landscape positions and distances from the house, mainly depending on the nutrient supply and available water resources. Highest grain yields were observed in the field which were near the house whereas lowest yield were seen in the field far from the house and on upper fields were water resources and nutrient supplies are limited.…”

Section: Introductionmentioning

confidence: 99%

Selection of drought tolerant rice varieties for the western mid hills of Nepal

Adhikari

Mehera

Haefele

2018

J. Inst. Agric. Anim. Sci.

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Rice (Oryza sativa L) is the most important staple food crop in Nepal, but current yields are low and total production varies, mostly due to drought. To evaluate high yielding and drought tolerant rice genotypes in typical rainfed lowland conditions, a participatory varietal selection trials was conducted with farmers in farmer's field at Sundarbazar, Lamjung, Nepal during the wet season 2009 and 2010.Trials were laid out in a Randomized Complete Block Design with six replications. Results obtained from two years' experiment indicated that the genotypes IR-74371-54-1 and IR74371-70-1 matured at the same duration as the local check Radha-4 (120-123 days growth duration). Both genotypes had a high average chlorophyll content (SPAD reading of 15.9-16.1), were medium tall (110-112 cm), non-lodging, had a high number of filled grains and little sterility, and a high grain yield (mean yield 5.0 and 4.8 t ha -1 , respectively). They also had the highest root length (22.4-26.2 cm) and root weight (9.5-10 g hill -1 ) which could tolerate more drought than the other genotypes tested. The maximum cost/benefit ratio was found in IR-74371-54-1 (1:1.72) followed by IR-74371-70-1 (1:1.66) and IR-74371-46-1-1 (1:1.65). All three lines were highly preferred by farmers in preference rankings during field visits and were released in Nepal in 2011 as Sookhadhan-2, Sookhadhan-3 and Sookhadhan-1 varieties, respectively. They fit easily into the existing cropping system in rainfed lowlands, are economically viable and safe to cultivate for the farmers in the mid hills of Nepal.

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