Nitrogen and phosphorus use efficiencies and losses in the food chain in China at regional scales in 1980 and 2005

Ma, Lin; Velthof, G.L.; Wang, F.H.; Qin, Wei; Zhang, W.F.; Liu, Zhidan; Zhang, Y.; Wei, Jing; Lesschen, J.P.; Ma, Wenqi; Oenema, O.; Zhang, F.S.

doi:10.1016/j.scitotenv.2012.03.028

Cited by 226 publications

(232 citation statements)

References 40 publications

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“…The oversupply of nutrients or an imbalance between nutrients reduces the efficiency of nutrient use. As a consequence, the mean N-use efficiency in crop production in China has decreased drastically from 32% in 1980 to 26% in 2005 and is much lower than the efficiency achieved in many developed countries [7].…”

Section: Introductionmentioning

confidence: 94%

The Impact of Agricultural Extension on Farmer Nutrient Management Behavior in Chinese Rice Production: A Household-Level Analysis

Pan

2014

Sustainability

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Agricultural nutrients play a critical role in food production and human nutrition in China. Against this backdrop, agricultural extension services are essential for providing farmers with knowledge and information about nutrient management. By using a propensity score-matching (PSM) approach, this study examines the impact of agricultural extension on farmer nutrient management behavior. Survey data about rice farmers in seven provinces of rural China are used. The empirical results indicate that participation in agricultural extension has a positive impact on rationalizing farmer nutrient management behavior. However, this impact is trivial. Compared with non-participating farmers, the reduced ratio of total fertilizer use and total inorganic fertilizer use by participating farmers is only 1.7% to 3.7%, and the improved ratio of the total organic fertilizer use and the level of soil-testing-based fertilizer use by participating farmers is only 1.008% to 1.173%. Additionally, the causal impacts of agricultural extension participation on nutrient management behavior tend to be higher for more educated, risk-loving and larger-scale farmers. This study reveals that China faces great challenges in implementing improved nutrient management practices for hundreds of millions of farmers through extension services. The findings also have important implications for China's extension system to meet the objectives of improving nutrient management.

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Section: Introductionmentioning

confidence: 94%

The Impact of Agricultural Extension on Farmer Nutrient Management Behavior in Chinese Rice Production: A Household-Level Analysis

Pan

2014

Sustainability

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“…Output was defined as the net food output for domestic use and the net export of food and feed, as follows from the FAO databases. The calculation procedure of output follows the one outlined by Ma et al (2010Ma et al ( , 2012. However, output from the crop and Agroecosyst (2018) 110:197-211 207 animal production sectors used for industrial purposes, including bioenergy production, was neglected due to lack of data.…”

Section: Agglomeration Of Livestock Production and Nutrient Balancesmentioning

confidence: 99%

International trade of animal feed: its relationships with livestock density and N and P balances at country level

Wang

Liu

Hou

et al. 2017

Nutr Cycl Agroecosyst

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International trade of food and feed has facilitated the specialization and agglomeration of agricultural production systems in many countries. Confined animals in specialized production systems are increasingly supplied with soybean and maize, imported from other countries. This has increased animal productivity but has also contributed to spatially decoupled crop and animal production systems. We analyzed the changes in the trade of soybean and maize at the global level in the period 1961-2011, and related these to the changes in livestock density and nutrient balances in the whole food system for 11 selected countries. Export of soybean and maize remained dominated by few countries (mainly USA, Argentina and Brazil) during the period 1961-2011, while the number of importing countries increased. Increases in the import of maize and soybean are positively related with changes in livestock density and N and P balances of national food systems. Imported soybean accounted for 12-36% of the calculated N balance at country level, and imported maize for 0-26%. There were large differences between importing countries; increases in the N surplus ranged from 75 to 306 kg N/ha and in the P surplus from 2 to 49 kg P/ha when the mean livestock density increased 1 LU/ha. This variation is related to differences in nutrient management regulations and to spatial variations in livestock density within countries. Our study contributes to the understanding of the complex relationships between the international trade of animal feed, livestock density and environmental impacts associated with N and P balances.

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“…It is one of the factors that limit yield in most crops (Xie et al, 2014). Suboptimal P fertilizer input may lead to poor growth and malfunctioning in plants, whereas over optimal P input may lead to low P efficiency (Ma et al, 2012). Most Brazilian soils have high weathering degree, large iron and aluminum oxide amounts and clay belonging to the kaolinite minerals group, which is characterized by surface charges presence, varying according to the soil solution reaction (Torres et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Critical phosphorus levels and availability for castor oil plant grown in different soil classes of Brazil

Neto¹,

Büll²,

Silva³

et al. 2017

Aust J Crop Sci

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The current study aims to determine critical P levels in different soil classes and their availability for castor bean initial growth. Extraction was done using Mehlich-1 and ion-exchange resin. The experiment was conducted in a greenhouse, in a randomized blocks design with the application of five P doses, which were previously set for each of the four experimental soils (TCo: Chromic Orthic Luvisol; CXbe: Eutrophic Haplic Cambisol; CXve: Typical Eutrophic Cambisol; RY: Fluvic), with four repetitions for 40 days. In the end of the experiment, plants were harvested and shoot dry mass was weighted. At the time plants were collected, samples were gathered to determine soil P availability through Mehlich-1 and ion-exchange resin. Mehlich-1 was more efficient in phosphorus recovery in the following soils: TCo, CXbe and CXve, regardless of applied dose. Critical P levels ranged from 21.33 to 416.64 mg dm -3 due to the clay content in Mehlich-1, and from 30.70 to 177.55 mg dm -3 in resin. MPAC presented positive coefficients regarding soil clay content. The highest castor bean shoot dry mass production was found in CXve and TCo soils. It ranged from 34.65 to 33.55 g vessel -1 in the treatment containing the lowest P dose applications (87.94 mg dm -3 and 104.33 mg dm -3 , respectively).

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Nitrogen and phosphorus use efficiencies and losses in the food chain in China at regional scales in 1980 and 2005

Cited by 226 publications

References 40 publications

The Impact of Agricultural Extension on Farmer Nutrient Management Behavior in Chinese Rice Production: A Household-Level Analysis

The Impact of Agricultural Extension on Farmer Nutrient Management Behavior in Chinese Rice Production: A Household-Level Analysis

International trade of animal feed: its relationships with livestock density and N and P balances at country level

Critical phosphorus levels and availability for castor oil plant grown in different soil classes of Brazil

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