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

1983 ◽  
Vol 74 (2) ◽  
pp. 223-228 ◽  
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

Rate and timing of nitrogen fertilizer application on potato ‘FL1867’. Part I: Plant nitrogen uptake and soil nitrogen availability

2015 ◽  
Vol 183 ◽  
pp. 246-256 ◽  
Author(s):  
Lincoln Zotarelli ◽  
Libby R. Rens ◽  
Daniel J. Cantliffe ◽  
Peter J. Stoffella ◽  
Douglas Gergela ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Nitrogen Availability ◽  
Fertilizer Application ◽  
Soil Nitrogen Availability ◽  
Plant Nitrogen ◽  
Plant Nitrogen Uptake

An evaluation of indices of available soil nitrogen

1970 ◽  
Vol 10 (42) ◽  
pp. 89 ◽  
Author(s):  
RR Storrier ◽  
AT Hanly ◽  
HI Nicol
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Uptake ◽  
Dry Matter ◽  
Mineral Nitrogen ◽  
Soluble Nitrogen ◽  
Dry Matter Yield ◽  
Soil Tests ◽  
Plant Nitrogen ◽  
Matter Production ◽  
Nitrate Fertilizer

Various chemical and biological measures of available soil nitrogen were evaluated as potential soil tests by estimating their relationship with the dry matter production and nitrogen uptake of ryegrass (Lolium perenne) from twelve soils treated with several rates of nitrate fertilizer. The response of the ryegrass to fertilizer was similar for all soils, and did not show any relationship with the soil tests. However, the mean dry matter yield and mean nitrogen uptake for all treatments were significantly related to some of these tests. Generally, soil nitrogen indices that measured total mineral nitrogen at planting or included this value with an estimate of the potentially available organic nitrogen gave the higher correlations. Incubation nitrogen values gave lower correlations. The best index of available soil nitrogen was based on a multiple regression involving total mineral nitrogen and alkali-permanganate soluble nitrogen. It accounted for 92 and 96 per cent of the variation in dry matter yield and plant nitrogen uptake respectively.

Evaluation of the nitrogen contribution of legumes to subsequent cereals

1992 ◽  
Vol 119 (1) ◽  
pp. 13-18 ◽  
Author(s):  
S. K. A. Danso ◽  
I. Papastylianou
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Uptake ◽  
Dry Matter ◽  
Nitrogen Availability ◽  
Dry Matter Yield ◽  
Nitrogen Yields ◽  
N Enrichment ◽  
Yield Responses ◽  
Field Plots ◽  
Barley Crop

SummaryThe effects of a preceding (1986/87) season's crop of vetch (Vicia saliva) or oats (Avena sativa), either singly or as two different mixtures, on the nitrogen uptake and growth of a succeeding barley crop (Hordeum vulgare) were examined in Cyprus in 1987/88, on field plots previously labelled (1984/85) with 15N enriched organic matter. Grain as well as the vegetative material were harvested before planting the barley. Barley after vetch accumulated 61 % more nitrogen than barley after oats, while, for the mixtures, the nitrogen yields in the succeeding barley crop did not differ significantly from those of barley grown after oats. The 15N enrichment in barley indicated that fixed N2 from vetch contributed little nitrogen to the available soil nitrogen pool and to the nitrogen in barley. Most of the increased assimilation of nitrogen in barley following vetch (compared to barley after oats) was attributable to a greater availability of soil nitrogen arising from the lower soil nitrogen uptake by the preceding vetch than oats. The dry matter yield of barley following vetch was 84% higher than for barley after oats, while barley after the vetch-oats mixtures yielded 38–54% higher than barley following oats. It was concluded that greater nitrogen availability to the cereal following the legume was not the sole cause of the dry matter yield responses observed.

AN EVALUATION OF NITROGEN SOIL TEST METHODS FOR ONTARIO SOILS

1966 ◽  
Vol 46 (2) ◽  
pp. 185-194 ◽  
Author(s):  
J. A. Smith
Keyword(s):  
Soil Nitrogen ◽  
Dry Matter ◽  
Nitrogen Availability ◽  
Test Methods ◽  
Soil Test ◽  
Soil Nitrogen Availability ◽  
Available Nitrogen ◽  
Nitrogen Contents ◽  
Total Soil Nitrogen

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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