AN EVALUATION OF NITROGEN SOIL TEST METHODS FOR ONTARIO SOILS

Several methods for providing an index of the availability of soil nitrogen were evaluated by relating laboratory soil test values to yields of dry matter and uptake or nitrogen by orchardgrass in the greenhouse. Determination of soil organic matter or total soil nitrogen contents was relatively ineffective. Available nitrogen initially present in the soil at sampling time, extracted by several different methods, was superior to measurements of nitrogen released upon incubation. The nitrate form of nitrogen, either initially present or released upon incubation, served as a better index of soil nitrogen availability than the ammonium form. Inclusion of initial nitrates and nitrates released upon incubation as independent variables in a multiple regression resulted in the highest correlation with total nitrogen uptake. In the three incubation methods evaluated, discarding the initial nitrogen content of the soil, as is commonly done, severely reduced the validity of the tests as measures of nitrogen availability.

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Correlations between indexes of soil nitrogen availability and nitrogen percent in plant, nitrogen uptake, and dry-matter yield of rice grown in the greenhouse

Plant and Soil ◽

10.1007/bf02143612 ◽

1983 ◽

Vol 74 (2) ◽

pp. 223-228 ◽

Cited By ~ 9

Author(s):

K. L. Sahrawat

Keyword(s):

Soil Nitrogen ◽

Nitrogen Uptake ◽

Dry Matter ◽

Nitrogen Availability ◽

Dry Matter Yield ◽

Soil Nitrogen Availability ◽

Plant Nitrogen ◽

Plant Nitrogen Uptake

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Soil-related terroir factors: a review

OENO One ◽

10.20870/oeno-one.2018.52.2.2208 ◽

2018 ◽

Vol 52 (2) ◽

pp. 173-188 ◽

Cited By ~ 20

Author(s):

Cornélis Van Leeuwen ◽

Jean-Philippe Roby ◽

Laure De Rességuier

Keyword(s):

Water Supply ◽

Soil Temperature ◽

Soil Nitrogen ◽

Nitrogen Availability ◽

Potential Evapotranspiration ◽

Water Status ◽

Aroma Compounds ◽

Soil Nitrogen Availability ◽

Available Nitrogen ◽

Berry Size

A “terroir” is a cultivated ecosystem in which the vine interacts with the soil and the climate. The soil influences vine development and grape ripening through soil temperature, water supply and mineral supply. Soil temperature has a significant effect on vine phenology. Limited water supply to the vines restricts shoot and berry growth, which is critical for reaching a suitable grape composition to produce high-quality red wines. Secondary metabolites, like polyphenols (anthocyanins, tannins) and aroma compounds or their precursors, are impacted in particular by vine water status. Among nutrients vines pick up from the soil, nitrogen plays a key role. Nitrogen influences vine vigor, yield, berry size and grape composition. Low nitrogen supply stimulates the synthesis of polyphenols, while it can negatively impact certain aroma compounds in grapes and wines. Over the past decades, tools have been developed to quantify terroir parameters. Vine water status can be assessed by means of carbon isotope discrimination measured on grape sugar (so-called δ13C). Vine nitrogen status can be assessed with the measurement of Yeast Available Nitrogen (YAN). In this way, terroir parameters can not only be measured but also mapped. Ideally, vineyards should be established in areas where soil temperature (relative to air temperature), soil water holding capacity (relative to rainfall and potential evapotranspiration) and soil nitrogen availability are optimum for the type of wine which is intended to be produced. Terroir expression can, however, be optimized by choosing appropriate plant material, and via vineyard floor management, fertilization and other management techniques.

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Spatial assessment of soil nitrogen availability and varying effects of related main soil factors on soil available nitrogen

Environmental Science Processes & Impacts ◽

10.1039/c6em00407e ◽

2016 ◽

Vol 18 (11) ◽

pp. 1449-1457

Author(s):

Mingkai Qu ◽

Weidong Li ◽

Chuanrong Zhang ◽

Biao Huang ◽

Yongcun Zhao

Keyword(s):

Spatial Distribution ◽

Soil Nitrogen ◽

Nitrogen Availability ◽

High Availability ◽

Soil Factors ◽

Soil Nitrogen Availability ◽

Available Nitrogen ◽

Distribution Maps ◽

Soil Available Nitrogen ◽

Availability Ratio

Based on the spatial distribution maps of the soil AN and NAR, vulnerability areas with a low available concentration and low/high availability ratio of soil nitrogen were delineated based on different thresholds of the soil AN and NAR.

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EFFECT OF AVAILABLE SOIL NITROGEN ON YIELDS AND RESPONSE OF BRUSSELS SPROUTS TO APPLIED NITROGEN IN THE FIELD

Canadian Journal of Plant Science ◽

10.4141/cjps70-050 ◽

1970 ◽

Vol 50 (3) ◽

pp. 261-266 ◽

Cited By ~ 3

Author(s):

D. C. MUNRO ◽

J. A. CUTCLIFFE

Keyword(s):

Soil Nitrogen ◽

Leaf Tissue ◽

Yield Potential ◽

Soil Tests ◽

Available Nitrogen ◽

Brussels Sprouts ◽

Tissue Nitrogen ◽

Total Soil Nitrogen ◽

Applied Nitrogen

Determination of nitrate nitrogen in the soil at transplanting time was the best soil test for prediction of yield potential and relative response of Brussels sprouts (Brassica oleracea var. gemmifera DC, Jade Cross) to applied nitrogen. Actual fertilizer nitrogen requirement of a soil could not be predicted from soil tests. Total soil nitrogen was the best alternative to original soil nitrate for prediction of yield potential of the soil. Total nitrogen in leaf tissue from maximum-yielding plots averaged 5.6%. Approximately 5.2% tissue nitrogen was necessary for good yields. Concentration of nitrogen in leaf tissue from control plots could not be predicted from soil tests for available nitrogen. Over a period of three years at four locations per year, 67 kg nitrogen per ha applied in bands was adequate for maximum yields of Brussels sprouts at most locations.

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Evaluation of Soil Test Methods for Available Nitrogen, Phosphorus and Potassium in Direct-Seeded Rice–Wheat Cropping Sequence

Journal of AgriSearch ◽

10.21921/jas.v6i02.18101 ◽

2020 ◽

Vol 6 (02) ◽

Author(s):

VIJAY KANT SINGH ◽

POONAM GAUTAM ◽

KHARAG SINGH ◽

SUMAN SEN ◽

VINEET KUMAR ◽

...

Keyword(s):

Test Methods ◽

Test Method ◽

Coefficient Of Determination ◽

Soil Test ◽

Available Nitrogen ◽

Available N ◽

Direct Seeded ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus

A study was carried out in an attempt to obtain simple and efficient soil test method(s) for determination of available nitrogen (N), phosphorus (P) and potassium (K) in Mollisols. Soil samples were collected before sowing of direct-seeded rice (DSR) and wheat in sequence to evaluate the soil test methods for available N, P and K. Methods used were wet-oxidation for organic carbon (OC); alkaline KMnO4 for available N; Olsen’s-P, AB-DTPA and Mehlich-I for available P; and NH4OAc-K, AB-DTPA and Mehlich-I for available K. Suitability of these methods for given soil nutrients was evaluated by comparing the R2 values (coefficient of determination) obtained from regression analysis. Results showed that the R2 values of obtained equations by using different combinations of soil test methods for the determination of available N, P and K in soil were highly significant in both the crops. Highest R2 value for DSR (0.442**) and wheat (0.898**) were observed with the combination of OC, Olsen’s-P, ABDTPA-K, and OC, Olsen’s-P, Mehlich-K, respectively. It showed that these combinations are more promising and superior over other methods.

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