The Control of Soil Fertility

Cooke, G. W.

doi:10.1097/00010694-196908000-00017

Cited by 38 publications

(50 citation statements)

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“…The level of P av is also rated as deficient irrespective for any crop, based on the interpretation given by Cooke (1967). The problem with P av unavailability is limited as the pH level in the reservoir is in the optimal range, that is, mean pH ¼ 7Á76.…”

Section: Fertility Status Of the Reservoir Sedimentsmentioning

confidence: 99%

Sediment‐bound nutrient export from micro‐dam catchments in Northern Ethiopia

Haregeweyn¹,

Poesen²,

Deckers³

et al. 2007

Land Degrad Dev

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The losses in soil nutrients (nitrogen (N), available phosphorus (P av ), organic carbon (OC), potassium (K), calcium (Ca) and magnesium (Mg)) in the catchment and the storage in the reservoir as a result of sediment delivery were assessed in 13 catchments/reservoirs in Tigray, Northern Ethiopia. This specifically dealt with factors controlling the losses, the fertility status of the deposited sediment, the nutrient export (NE) rates and associated costs.Enrichment ratio (ER) values >1 were observed for the plant nutrients and the finer soil fractions. The high ER is associated with the preferential transport of nutrients bound to finer soil fractions and the parent material dissolution and its transport via runoff. However, the fertility status of the deposited sediment is not sufficient by itself to support a sustainable crop growth and hence external addition is necessary, mainly for N and P av fertilizer.Generally, rates of NE were high. The high OC export on the other hand dictates the potential of reservoir sediments for OC sequestration. The cost price of loss of only N and P av , eroded from the catchment slopes, was estimated at s34Á2 million (Euros) in March 2006 for the Tigray. Pity enough, policy makers and beneficiaries do not realize the magnitude of the problem, which forms a major threat for the crop production in the country. Therefore, it is important not only to make the public aware of the problem but also of implementing integrated soil fertility management practices.

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Section: Fertility Status Of the Reservoir Sedimentsmentioning

confidence: 99%

Sediment‐bound nutrient export from micro‐dam catchments in Northern Ethiopia

Haregeweyn¹,

Poesen²,

Deckers³

et al. 2007

Land Degrad Dev

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“…Substantial quantities are retained by fibrous roots, some of which die and are metabolized in soil. Some may be lost by leaf fall, some by leaching of organic-N compounds (Tukey, 1970) and some by volatilization of ammonia from the plants (Cooke, 1967). Nevertheless in most experiments it is found that the amount in above ground parts of the plant is linearly related to the level of N-fertilizer (Spiertz, 1980;van Keulen and van Heemst 1982).…”

Section: Nitrate Absorption By Plant Rootsmentioning

confidence: 99%

“…Ammonium ions can be fixed by clay minerals and thereby rendered unavailable to plants. In addition ammonium ions are in pseudo equilibrium with ammonia gas which diffuses to the atmosphere above the soil, a process responsible for the loss to agriculture of a large proportion of N in excreta of animals (Cooke, 1977), Equations have been derived for each of these processes (e.g. Stanford, Frere and Schwaninger, 1973;Stanford and Epstein, 1974;Jenkinson and Rayner, 1977;Frissel and van Veen, 1981).…”

Section: Inorganic Nitrogen In Soilmentioning

confidence: 99%

“…Most of us are very conscious of food surpluses in western Europe but it is worth bearing in mind that they have been achieved only at enormous cost to other industries and activities. If the huge subsidies to agriculture are curtailed, as many wish, then more attention might be given than at present to cutting costs, including those associated with the present inefficient and wasteful use of fertilizer, (Cooke, 1977).…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Theory and the Control of Soil Fertility

Greenwood¹

1983

New Phytologist

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“…Cook (1967) relates soil fertility to the amount of available nutrients while others meager it by the yield capacity still others, look it to be a function of organic matter or even soil texture. Balanced use of Fertilizers is a basic need for boosting crop production.…”

Section: Introductionmentioning

confidence: 99%

Organic Matter Status of Gujar Khan Tehsil

Qureshi¹,

Qureshi²,

Yousuf³

et al. 2000

Pakistan J. of Biological Sciences

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Abstract:A study was conducted to investigate the organic matter status of Tehsil Gujar Khan of district Rawalpindi. Forty eight composite soil samples were collected from different sites of Tehsil. These samples were analyzed for organic matter. Organic matter was deficient or poor <0.86% in all the soil samples analyzed. The maximum organic matter of 0.8% were recorded at Bardiana site and minimum organic matter of 0.25% were observed at Gulliana site. The average maximum organic matter of 0.6% were observed at Bardiana and Daultala sites in the Tehsil. The low organic matter at most of the sites may be due to eroded nature of soils in this area. Fertilizer recommendations were advised to farmers according to soil condition and organic matter status of the soil.

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The Control of Soil Fertility

Cited by 38 publications

References 0 publications

Sediment‐bound nutrient export from micro‐dam catchments in Northern Ethiopia

Sediment‐bound nutrient export from micro‐dam catchments in Northern Ethiopia

Quantitative Theory and the Control of Soil Fertility

Organic Matter Status of Gujar Khan Tehsil

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