Comparison of wheat yield under uniform and variable rates of fertilizer on spatially‐eroded land

Bhatti, A. U.; Ali, Roshan; Ullah, Farman; Khan, Muhammad Jamal

doi:10.1080/00103629809370160

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…They found yield components not to be significantly different between NSSM and a uniform rate. Bhatti et al (1998) compared uniform N application on wheat with variable rate application based on crop productivity patterns and found no difference in grain yield, while the site-specific approach used less total N. These inconsistent results may be due to complex interrelationships between wheat and soil characteristics.…”

Section: Introductionmentioning

confidence: 89%

Delineation of management zones to improve nitrogen management of wheat

Peralta

Costa

Balzarini

et al. 2015

Computers and Electronics in Agriculture

113

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Section: Introductionmentioning

confidence: 89%

Delineation of management zones to improve nitrogen management of wheat

Peralta

Costa

Balzarini

et al. 2015

Computers and Electronics in Agriculture

113

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“…Mulla et al (1992) created site‐specific management units (18.3 m by 564–655 m) based on preseason soil N (nitrate N and ammonium N) tests and available soil water content. Similarly, Bhatti et al (1998) created site‐specific N management units based on crop productivity. In both cases, site‐specific N reduced N fertilizer application up to 70% without a reduction in grain yield compared to a grower's practice.…”

mentioning

confidence: 99%

In-Season Optimization and Site-Specific Nitrogen Management for Soft Red Winter Wheat

et al. 2004

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application up to 70% without a reduction in grain yield compared to a grower's practice.Site-specific N management based on an in-season assessment of Stone et al. (1996) used an on-the-go sensor measurcrop N status may offer producers increased grain yield, profitability, ing plant N spectral index to create submeter siteand spring N fertilizer use efficiency (SNUE). The goal of this study specific N management units based on an estimate of was to determine the distinct contributions of (i) in-season N rate optimization and (ii) site-specific N management. Our objective was R.

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“…The spatial variability of nutrients in soils is much greater than that found in large-scale farming in developed countries (Jin 1998). The prevailing nutrient management technologies in developed countries, such as site-specific nutrient management (SSNM) (Mulla et al 1992, Kincheloe 1994, Sawyer 1994, Bhatti et al 1998, field-specific nutrient management (Scharf et al 1993, Olk et al 1999, Weisz et al 2001, Vanlauwe et al 2006 and pre-side dress soil nitrate-N test (Magdoff et al 1984, 1990, Fox et al 1989) are difficult to apply in China because of the expense of numerous soil sampling and testing costs (Bai andJin 2004, Zheng et al 2005). There are very few SSNM systems available in China (Chen and Zhang 2006), and excessive use of fertilizers in agricultural fields is common with detrimental impacts of excessive leaching of nitrate to groundwater and more diffuse contamination of surface waters by nitrogen (N) and phosphorus (P) (Zhu and Chen 2002).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of soil nutrients and GIS-based nutrient management in Yongji County, China

Zhang¹,

Yang²,

Li³

et al. 2010

International Journal of Geographical Information Science

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Integrated nutrient management is important for sustainable agricultural production and protecting environment quality and has been widely investigated around the world. In this article the spatial variability of soil nutrients was investigated and a regionalized nutrient management system was developed using geostatistics and geographic information system technologies. A total of 511 GPS-referenced soil samples were taken in Yongji County, Shanxi province, China, and analysed for major soil nutrients: soil total nitrogen (TN), Olsen extractable phosphorus (OLSENP) and extractable potassium (EXTK). Low concentrations of nitrogen (N) and phosphorus (P) were found and they are likely to be the main limiting nutrients for crop growth in this county. Within the county moderate spatial dependence was found for all three soil variables, but at different spatial scales. The spatial distributions of TN, OLSENP and EXTK were estimated by using kriging interpolation. The cropped areas of the county were divided into fertilizer management categories consisting of four classes of TN, three classes of OLSENP and two classes of EXTK. For the targeted crop yields, regionalized fertilization maps of N, P and K in the county were produced using geographic information system. In 3-year field verification trials in two villages the crop yields of the wheat-maize rotation system increased by 10-20%, and farmers' cash income increased by 1550-2610 RMB ha -1 year -1 where regional fertilization recommendations were implemented, in comparison with traditional farmers' practices. The regionalized maps are a practical alternative to site-specific soil nutrient management approaches in areas where it is not practical, because of small farm size or other constraints, to use intensive soil sampling and chemical analyses.

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Comparison of wheat yield under uniform and variable rates of fertilizer on spatially‐eroded land

Cited by 8 publications

References 3 publications

Delineation of management zones to improve nitrogen management of wheat

Delineation of management zones to improve nitrogen management of wheat

In-Season Optimization and Site-Specific Nitrogen Management for Soft Red Winter Wheat

Spatial variability of soil nutrients and GIS-based nutrient management in Yongji County, China

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