Phosphorous and Foliar Applied Nitrogen Improved Productivity and Quality of Potato
Growth, yield and quality of potato are greatly affected by its
nutritional management. Foliar application of urea reduces nitrogen
losses and increases plant nitrogen use efficiency. This study was
therefore planned to evaluate the effect of soil applied phosphorus
(DAP) and foliar application of nitrogenous fertilizer (urea) on growth,
yield and quality of potato. Experiment was comprised of four different
treatments of phosphorus (DAP, 46% P) and nitrogen (urea, 46% N)
including a control. Treatments were T0 (DAP 160 + Urea 300 kg/acre), T1
(DAP 160 + Urea 5 kg/acre), T2 (DAP 100 + Urea 6 kg/acre) and T3 (DAP
120 + Urea 8 kg/acre). DAP fertilizer was given as basal dressing at the
time of sowing. Foliar applications of nitrogenous fertilizer (urea)
were given after 30 of sowing with one week interval in five split
doses. Results indicated that T3 remained better regarding productivity
and quality of potato. The overall fertilizer efficacy regarding yield
and quality was: T3 ˃ T2 ˃ T1 ˃ T0. However, Vitamin C was found maximum
in T0.
Publisher: American Journal of Plant Sciences
http://file.scirp.org/pdf/AJPS_2015011513431971.pdf
What is DAP? Diammonium phoshphate, an old time commercial fertilizer. Diammonium phosphate (DAP) is a highly water-soluble fertilizer used in a number of multi-component fertilizer mixtures as well as in directly applied compound fertilizers. Aside from monoammonium phosphate (MAP), it is the world’s most commonly used phosphate fertilizer, Phosphates are mined in the form of rock phosphate. Phosphates react with sulphuric acid to produce phosphoric acid, which in turn reacts with ammonia. This process converts the poorly water-soluble rock phosphate into a water-soluble phosphate fertilizer that is easily taken up by plants.
Viragrow has chosen MAP over DAP as its pre-planting fertilizer. Why? it is not as "hot", not as likely to burn plants for several reasons AND it helps lower soil pH (lowers alkalinity) better than DAP. Like DAP, t is also 100% water soluble.
Apply it directly to the soil or mix it with warm water and apply it as a liquid to the leaves of plants for a more immediate response. Make a 0.25 to 0.5% solution of MAP to apply to the leaves.
Dissolve 1 1/4 tbs of MAP in one gallon of water for a 0.5% solution for spraying on leaves.
What is DAP? Diammonium phoshphate, an old time commercial fertilizer. Diammonium phosphate (DAP) is a highly water-soluble fertilizer used in a number of multi-component fertilizer mixtures as well as in directly applied compound fertilizers. Aside from monoammonium phosphate (MAP), it is the world’s most commonly used phosphate fertilizer, Phosphates are mined in the form of rock phosphate. Phosphates react with sulphuric acid to produce phosphoric acid, which in turn reacts with ammonia. This process converts the poorly water-soluble rock phosphate into a water-soluble phosphate fertilizer that is easily taken up by plants.
Viragrow has chosen MAP over DAP as its pre-planting fertilizer. Why? it is not as "hot", not as likely to burn plants for several reasons AND it helps lower soil pH (lowers alkalinity) better than DAP. Like DAP, t is also 100% water soluble.
Apply it directly to the soil or mix it with warm water and apply it as a liquid to the leaves of plants for a more immediate response. Make a 0.25 to 0.5% solution of MAP to apply to the leaves.
Dissolve 1 1/4 tbs of MAP in one gallon of water for a 0.5% solution for spraying on leaves.
available in 10 and 40 lb bags at 80 cents per pound
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