Evaluation and control of the nutritional status of cereals

Nielsen, J.M.; Friis-Nielsen, Bodil

doi:10.1007/bf00011698

Cited by 24 publications

(2 citation statements)

References 7 publications

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“…The principle is that the upper limit of points in a scatter diagram delineates the response of the dependent variable (TF and To yields) to a particular independent variable (soil and crop management) if other variables are not limiting. The approach was first employed to determine critical values of nutrient balances in plant diagnostic models (M011er-Nielsen & Frijs-Nielsen, 1976;Frasor & Eaton, 1983;Walworth et al, 1986). Later it was used to describe the relationship between soil nutrient contents and yields (Evanylo & Summer, 1987;Evanylo, 1990).…”

Section: Analysis Of the Farmer Trialsmentioning

confidence: 99%

Explaining yield gaps on farmer-identified degraded and non-degraded soils in a Sahelian irrigated rice scheme

Asten

Wopereis²,

Haefele³

et al. 2003

NJAS: Wageningen Journal of Life Sciences

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Farmers in the Foum Gleita irrigation scheme in southern central Mauritania experienced declining rice yields, and within a decade after its establishment 12% of the scheme's land had been abandoned.Actual rice yields (:,> 4.0 t ha-I ) are low in comparison with potential yield (ca. 8 t ha-I ) and with yields elsewhere in the Sahel (4-6 t ha-I ). Farmers related the productivity problems to salt efflorescences on the soil surface. Rice yields on the 'upper and middle slope' soils were lower (3.4 t ha-I ) than the yields on soils further down the slope (> 4.2 t hal ). Farmers classified the 'upper and middle slope' soils as degraded, but following the USDA classification the soils could not be classified saline or sodic. Low yields on the 'degraded' soils were related to co-limitation of nitrogen (N) and phosphorus (P), which was due to low soil N supply (ca. 18 kg ha-I ) , low soil P supply (ca. 8 kg ha' I ), occasional low N fertilizer doses (35 kg N ha-I ) in combination with low N fertilizer recovery efficiency (0.3 kg kg-I), or non-application of P fertilizer. On the 'non-degraded' soils, soil P supply (ca. 16 kg ha' I ) was higher and N deficiency prevailed despite a higher soil N supply (ca. 32 kg ha") and a higher N fertilizer recovery efficiency (0.4 kg kg' I ). Higher contents of carbonate salts in the 'degraded' soils increase soil pH (> 7.5) and are, therefore, likely to contribute to low soil P supply and low N fertilizer recovery efficiency.

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Section: Analysis Of the Farmer Trialsmentioning

confidence: 99%

Explaining yield gaps on farmer-identified degraded and non-degraded soils in a Sahelian irrigated rice scheme

Asten

Wopereis²,

Haefele³

et al. 2003

NJAS: Wageningen Journal of Life Sciences

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“…The mathematical procedures to determine upper boundary line functions have been developed by Schnug et a l. [15]. Boundary lines describe the "pure effect of a nutrient" on crop yield under ceteris paribus conditions [16][17][18], as the line describes the highest yields observed over the range of nutrient values measured. Data points below this line relate to samples where some other factor limited the crop's response to the nutrient.…”

Section: Balanced Nutrient Supply-essential To Secure Productivity Anmentioning

confidence: 99%

Hungry Plants—A Short Treatise on How to Feed Crops under Stress

2018

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Fertilisation is as old as is the cultivation of crops. In the 19th century, plant nutrition became an area of research in the field of agricultural chemistry. Liebig's "Law of the Minimum" (1855) is still the basis for plant nutrition. It states that the exploitation of the genetically fixed yield potential of crops is limited by that variable, which is insufficiently supplied to the greatest extent. With a view to abiotic and biotic stress factors, this postulation should be extended by the phrase "and/or impaired by the strongest stress factor". Interactions between mineral elements and plant diseases are well known for essential macro-and micronutrients, and silicon. In comparison, the potential of fertilisation to alleviate abiotic stress has not been compiled in a user-orientated manner. It is the aim of this chapter to summarise the influence of nutrient deficiency in general, and the significance of sodium, potassium, and silicon, in particular, on resistance of crop plants to abiotic stress factors such as drought, salinity, and heavy metal stress. In addition, the significance of seed priming with various nutrients and water to provide tolerance against abiotic stress is discussed. Underlying physiological mechanisms will be elaborated, and information on fertiliser application rates from practical experiences provided.

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Comparative studies of plant and soil analysis for the sulphur status of oilseed rape and winter wheat

Haneklaus¹,

Fleckenstein²,

Schnug³

1995

J Plant Nutrition & Soil

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Recently S deficiency became one of the most widespread nutrient disorders in North-European agriculture. Therefore precise and reliable methods for the evaluation of the S nutritional status of agricultural crops are required. For the prognosis of the plant available S soil analysis wwld be a favourire method, however, no relation between plant S concentrations and mobile (extractable sulphete plus extactable organic S) S contents in soils could be stated. The reasons for the impracticability of traditional soil teas Seem to be relakd to interections betwan soil water and mobile S in soils. so that site specific models n a d to be developed for the prognosis of the S status of agricultural crops.

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Evaluation and control of the nutritional status of cereals

Cited by 24 publications

References 7 publications

Explaining yield gaps on farmer-identified degraded and non-degraded soils in a Sahelian irrigated rice scheme

Explaining yield gaps on farmer-identified degraded and non-degraded soils in a Sahelian irrigated rice scheme

Hungry Plants—A Short Treatise on How to Feed Crops under Stress

Comparative studies of plant and soil analysis for the sulphur status of oilseed rape and winter wheat

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