An approach towards interpreting and controlling the nutrient status of growing plants by means of chemical plant analyses

Friis-Nielsen, Bodil

doi:10.1007/bf01373074

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Concentration of Mg in the ryegrass was used in preference to total Mg uptake as the plant criterion of availability, since it was assumed that the Mg content of all the soils was high enough to ensure that dry-matter production was not limited by lack of Mg. Under these conditions, the concentration of Mg in the plant largely reflects the supply (Friis-Nielsen, 1966).…”

Section: Laboratory Studiesmentioning

confidence: 99%

Availability of magnesium in soils

Alston¹

1972

J. Agric. Sci.

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Twenty-five soils, including some subsoils, with widely differing properties were cropped with perennial ryegrass in the glasshouse, and measures of Mg availability in the soils were related to the Mg concentration in the plants.No single measure satisfactorily characterized Mg availability. The ion activity ratio, V°M8/V°oa+Mg> when the soil neither gained nor lost Mg on equilibration with 0-02 N-CaCl 2 , was more highly correlated (r = 0-75***) with Mg concentration in the ryegrass than was the best of the capacity measures tested (CaCl 2 -extractable Mg, r = 0'68***), particularly if the potential buffering capacity (PBCjig) of the soils was also taken into account, in which case r -0-83***.Exchangeable Mg (r = 0-67***) was a poorer index of Mg availability than percentage Mg saturation (r = 0-73***) or exchangeable Mg expressed as a percentage of the total exchangeable bases (K, Na, Ca and Mg) in the soil (r = 0-81***). This latter quantity was better than the activity ratio as a predictor of Mg availability (r = 0-81*** compared with r = 0-75***).A significant proportion of the variation in Mg concentration in the ryegrass could be attributed to the K content of the soils, and closer correlations were obtained when K was included in the composite activity ratio, V a Mg/(V a ca+Mg + J3-°K)> (r = 0-88***) or when a term for exchangeable K was included in regression analysis with VoMg/Aa+Mg and P B C W (' = 0-93***).The concentration of Mg in equilibrium soil solutions was generally a less satisfactory indicator of Mg availability than were the activity ratios.Soils derived from basaltic parent material had much higher contents of readily exchangeable Mg than the remainder: parent materials other than basalt had little influence on the availability of Mg in the soils. Exchangeable Mg and per cent Mg saturation were higher in gleyed soils than in freely drained soils derived from similar parent material.

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Section: Laboratory Studiesmentioning

confidence: 99%

Availability of magnesium in soils

Alston¹

1972

J. Agric. Sci.

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“…However, von Liebig did not af fi rm his hypothesis in terms of proportionality relations. Friis-Nielsen ( 1966 ) in an approach towards interpreting and controlling the nutrient status of growing plants by means of chemical plant analyses af fi rmed that either the Law of Maximum or the Law of Minimum may be decisive for plant growth, and their principles should be taken in consideration during the fertilization planning process. Mitscherlich ( 1909 ) attempted to make clear the Law of Minimum and in the Law of Diminishing Returns asserts that the increase in any crop produced by a unit increment of a de fi cient nutrient is proportional to the decrement of that nutrient from the maximum (Ware et al 1982 ) .…”

Section: Law Of the Minimummentioning

confidence: 99%

Fertigation: Concept and Application in Citrus

Quiñones

Martínez‐Alcántara

Primo‐Millo

et al. 2012

Advances in Citrus Nutrition

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Citrus is one of the most relevant crops worldwide with a yearly average production of 90 × 10 6 Mg. As in other crops, the use of fertilizers is crucial to maintain a high-quality yield. However, its abuse has led to environmental problems such as eutrophication, pollution, deforestation and loss of productive soil through erosion, in the last decades. Therefore, fertilizer together with other agricultural inputs (seeds, pesticides, water, machinery, etc.) should be managed more ef fi ciently, enhancing, at the same time, the development of new technologies and government policy that ensures an agricultural systems that will produce safe and quality fruits. A rational fertigation programme should consider not only plant requirements but also a rational seasonal distribution of nutrients. This chapter describes different considerations to keep into account an optimal fertigation schedule in order to improve nutrient use ef fi ciency, reduce nutrients losses and protect water quality.

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“…leaf by different methods Nielsen (1966) in surface soil (0-22.5 cm) and 0.10 mg kg -1 in the subsoil (22.5-45 cm) were observed to be critical for citrus trees (Ahmed et al2012).…”

Section: Standardisation Of Critical Boron Level In Soil Andmentioning

confidence: 99%

Standardization of critical boron level in soil and leaves of coconut palms grown in a tropical Entisol

Mathew

Krishnakumar

Srinivasan

et al. 2018

J. Soil Sci. Plant Nutr.

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An experiment was conducted to standardize the critical boron level in soil and leaf samples of coconut palms grown in a typical Entisol of the Onattukara region of Kerala, India. Graded levels of boron as borax were applied at 0, 6, 12, 18 and 24 g per palm per year in four split doses. The critical boron level in soil and leaves was standardized using the following methods: the Cate and Nelson graphical (CN) method, the Mistcherlich equation (ME), and the quadratic plateau response (QP) method. In the CN method, the critical level of boron in soil and leaves was 0.48 mg kg-1 and 11.5 mg kg-1 , respectively. In the ME model, the critical boron level in soil and leaves was 0.46 mg kg-1 and 7.55 mg kg-1 , respectively. In the QP response curve, the critical level of boron in soil was estimated to be 0.87 mg kg-1 , and in the leaf, the critical level was found to be 13.27 mg kg-1. Because the level estimated via the graphical method and by the Mistcherlich equation is similar with regard to the soil boron, 0.48 mg kg-1 can be considered as the critical boron level in soil. Regarding the critical boron level in the leaf, values estimated via the CN method and the QP response curve are in proximity, and, hence, the critical boron level in leaf is 13.27 mg kg-1. These results suggest the application of 160 g of borax in four split doses when the levels of boron in soil and leaves fall below the estimated critical values for better use efficiency.

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An approach towards interpreting and controlling the nutrient status of growing plants by means of chemical plant analyses

Cited by 5 publications

References 5 publications

Availability of magnesium in soils

Availability of magnesium in soils

Fertigation: Concept and Application in Citrus

Standardization of critical boron level in soil and leaves of coconut palms grown in a tropical Entisol

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