Soil fertility evaluation and management by smallholder farmer communities in northern Tanzania

Mowo, Jeremias; Janssen, B.H.; Oenema, O.; German, Laura; Mrema, Jerome; Shemdoe, Riziki

doi:10.1016/j.agee.2006.03.021

Cited by 71 publications

(58 citation statements)

References 24 publications

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“…The QUEFTS model has been applied successfully in other countries for rice (Witt et al, 1999;Haefele et al, 2003;Das et al, 2009;Buresh et al, 2010), maize (Janssen et al, 1990;Saïdou et al, 2003;Mowo et al, 2006;Tittonell et al, 2008;Tabi et al, 2008;Setiyono et al, 2010), and wheat (Pathak et al, 2003;Maiti et al, 2006). In China, nutrient requirements for maize (Liu et al, 2006;Zhang et al, 2012;Xu et al, 2013) and wheat (Liu et al, 2006;Chuan et al, 2013a) were estimated and used to develop fertilization recommendations (Chuan et al, 2013b;Xu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimating nutrient uptake requirements for rice in China

Xie

Hou

et al. 2015

Field Crops Research

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a b s t r a c tAccurate knowledge of the nitrogen (N), phosphorus (P), and potassium (K) requirements for rice (Oryza sativa L.) in China is essential to quantitatively estimate optimal fertilizer application regimes to maximize crop yield and increase nutrient use efficiency. On-farm experiments were collected in China's major riceproducing regions from 2000 to 2013, to determine the relationship between grain yield and nutrient uptake in the above-ground plant dry matter using the quantitative evaluation of the fertility of tropical soils (QUEFTS) model. The large datasets obtained which covered broader rice growing areas and ecology types (both indica and japonica) in China. The dataset was divided into two groups: single-season rice and early/middle/late rice, according to QUEFTS analysis. The QUEFTS model predicted a linear increase in grain yield if nutrients were taken up in balanced amounts until yield reached about 60-70% of yield potential. To produce 1000 kg of single-season rice grain, 14.8 kg N, 3.8 kg P, and 15.0 kg K were required in the above-ground plant dry matter, and the corresponding internal efficiencies (IEs) were 67.6 kg grain per kg N, 263.2 kg grain per kg P, and 66.7 kg grain per kg K. For early/middle/late rice, the amount of 17.1 kg N, 3.4 kg P, and 18.4 kg K were required in the above-ground plant dry matter to produce 1000 kg of grain, and corresponding IEs were 58.5 kg grain per kg N, 294.1 kg grain per kg P, and 54.3 kg grain per kg K. The QUEFTS model provides a scientific foundation for filtering high-yielding and high-efficiency variety, optimizing fertilizer application rate and developing nutrient management strategies to increase yield and nutrient use efficiency. This is the first report on comparison of the nutrient uptake of different ecology types in rice production area of China using QUEFTS model and test their feasibility through field validation.

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Section: Introductionmentioning

confidence: 99%

Estimating nutrient uptake requirements for rice in China

Xie

Hou

et al. 2015

Field Crops Research

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“…Therefore, the role of shell sand in shell ridge ecosystems cannot be replaced by silt and other soil constituents. However, compared to soil in agro-ecosystems, water and nutrient concentrations in shell sand, especially bio-available forms, are low (Mowo et al 2006). Decreasing suitability for habitation suggested that more attention should be given to shell ridge ecosystem preservation.…”

Section: Discussionmentioning

confidence: 99%

Shell sand properties and vegetative distribution on shell ridges of the Southwestern Coast of Bohai Bay

et al. 2012

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Little information is available about shell ridge ecosystems. Vegetative distribution and shell sand properties were investigated on a shell ridge in the Binzhou National Shell Ridge and Wetland Nature Reserve. 21 plant species were observed in the study area and, according to the Shannon-Weiner Index and species evenness, vegetative cover, and abundance varied significantly at different sites (P \ 0.05). Sand percent, dissolved organic C, total N, and available N concentrations were significantly higher in the upper layers, while total and available P and K concentrations were significantly higher in the lower profile. Plant species were divided into three groups based on canonical correspondence analysis. Group A included 10 plant species, and was well correlated with high available nutrient concentrations (dissolved organic C, and available N, P, and K) and sand moisture. Groups B and C were well correlated with total K, P and salinity. Thus shell sand properties affected the spatial distribution of vegetation in the study area. Due to the coarse texture, salinity was less than 0.4% and much lower than in adjacent soils. Ten saltsensitive plant species were found, accounting for 48% of the total plant species. Shell sand is therefore imperative to shell ridge ecosystem sustainability, and shell sand mining should be prohibited in the area.

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“…Land use change from dry land to rice paddies also usually improves soil quality (Bhandari et al 2002). Smallholder farm communities often improve soil quality indirectly by increasing the active participation of farmers (Mowo et al 2006;Huang et al 2007). The results of the current study support these findings.…”

Section: Discussionmentioning

confidence: 99%