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On-the-Go Sensing for Site-Specific Nitrogen Top Dressing
2002 Chicago, IL July 28-31, 2002, 2002The control of nitrogen top dressing by optical sensing of crop reflectance or -fluorescence is dealt with. Reflectance sensing using the point of inflection in the red-infrared range is based on the chlorophyll-concentration in the leaves as well as on the leaf-area-index.
null Heege +3 more
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Journal of Northeast Agricultural University (English edition), 2011
Abstract In order to research effects of the nitrogen top-dressing levels on carbon-nitrogen metabolism and yield of Desmodium styracifolium, a field experiment was conducted on the research farm of Guangxi University in 2007. Some physiological indexes and yield of D. styracifolium were compared among five nitrogen top-dressing levels (0, 37.5, 75.0,
Jiamin ZHOU +5 more
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Abstract In order to research effects of the nitrogen top-dressing levels on carbon-nitrogen metabolism and yield of Desmodium styracifolium, a field experiment was conducted on the research farm of Guangxi University in 2007. Some physiological indexes and yield of D. styracifolium were compared among five nitrogen top-dressing levels (0, 37.5, 75.0,
Jiamin ZHOU +5 more
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THE EFFECT OF NITROGEN TOP DRESSING ON YIELD AND PROTEIN CONTENT OF NITROGEN-DEFICIENT CEREALS
Canadian Journal of Soil Science, 1960Top dressings of ammonium nitrate were made during the growing season to crops of barley and oats showing symptoms of acute nitrogen deficiency. The addition of nitrogen in the early stages of plant growth resulted in increased vegetative growth and increased yields.
D. K. McBeath, J. A. Toogood
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Effect of nitrogen top-dressing on winter wheat yield, quantity and quality
Acta Alimentaria, 2005The effects of nitrogen (N) applications on Hungarian, French and Serbian winter wheat cultivars were studied in field trials conducted from 1996 to 2003 in a central Hungarian region, Hatvan-Nagygombos. Fertilizer rates of 0, 40, 80, 120, 40+40 and 80+40 kg ha-1 active ingredient were applied at tillering and after anthesis (Feekes 3 and Feekes 10.5).
Szentpétery, Zs. +3 more
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European Journal of Agronomy, 2020
Abstract The present study developed a method to use RapidEye satellite information for N management in durum wheat cultivation. The estimation of the N status was based on the development of Nitrogen Nutrition Index (NNI), referred to as the ratio between actual N concentration (Nac) and the minimum N content required to obtain maximum biomass ...
Fabbri C. +4 more
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Abstract The present study developed a method to use RapidEye satellite information for N management in durum wheat cultivation. The estimation of the N status was based on the development of Nitrogen Nutrition Index (NNI), referred to as the ratio between actual N concentration (Nac) and the minimum N content required to obtain maximum biomass ...
Fabbri C. +4 more
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Crop competitiveness influenced by seeding dates and top-dress nitrogen rates.
Communications in agricultural and applied biological sciences, 2009A competitive crop utilizes resources before they are available to the weeds. The essential steps of developing a competitive crop begin with good stand establishment. A vigorously growing crop is also important towards establishing a competitive stand. Components of establishing a good and vigorous crop stand include crop rotation, seedbed preparation,
L, Fodor +4 more
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African Journal of Range & Forage Science, 1997
Reports on investigations conducted to obtain an indication of applied nitrogen and phosphorus effects on previously productive and unproductive kikuyu pastures, and to evaluate varying patterns of application of nitrogen fertilizer on kikuyu productivity. Relates kikuyu phosphorus responses to phosphorus soil test values.
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Reports on investigations conducted to obtain an indication of applied nitrogen and phosphorus effects on previously productive and unproductive kikuyu pastures, and to evaluate varying patterns of application of nitrogen fertilizer on kikuyu productivity. Relates kikuyu phosphorus responses to phosphorus soil test values.
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Sweet corn responses to basal and top-dressed rates and sources of nitrogenous fertilizers
Australian Journal of Agricultural Research, 1992Sweet corn (Zea mays L. var. rugosa cv. Jubilee) was grown on a fine loamy clay krasnozem soil with banded nitrogen fertilizer at rates up to 200 kg N ha-1 from (NH4)2SO4 and 50 kg N ha-1 from each of NH4NO3 and urea. Some treatments were top-dressed with one or two applications of 50 kg N ha-1.
AA Salardini, LA Sparrow, RJ Holloway
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The effect of late nitrogenous top-dressing on the digestibility of hay
The Journal of Agricultural Science, 1948SUMMARYComparative digestibility trials have been carried out on hays top-dressed with nitrogenous fertilizers 8–13 days before cutting and on similar hays which were not top-dressed.The top-dressing resulted in an increase of 2·0% crude protein and 1·2% true protein.The digestibility of the protein was significantly higher in the top-dressed hays and ...
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The yield and composition of kale and cabbage with and without nitrogenous top-dressing
The Journal of Agricultural Science, 1957In 4 consecutive years, 1948 to 1952, combined varietal and manurial trials were carried out to obtain information on the yields of marrow-stem kale, thousand-head kale and cattle cabbage in the presence and absence of sulphate of ammonia applied as a top-dressing at the rate of 6 cwt./acre.Yield and composition of all crops were apparently affected by
M. E. Castle +3 more
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