Please have a look at this link.
http://scialert.net/fulltext/?doi=jas.2013.188.192
Arvind Ji, it is not clear whether response is due to N or P in DAP on crop yield? Some scientist s think that stometa openings in various field crops is narrower that that of the size of HPO4 and H2PO4 molecules i.e. the available forms of P to crop plants.
Phophorus is an immobile nutrient and it must be applied through band and r ing methods for effective uptake by plant roots ,thus application of DAP THROUGH FOLIAR method will not work because it has no chelating property to stick on leaves and it will be washed away by rains
Dr.Phogat,there is published work to support that foliar applied P is taken up by plants.Among the P sources ,the NaH2PO4,NH4H2PO4 and H3PO4 are rapidly absorbed by the leaves; although their utilization is considerably dependent on plant species.The following review article provides good account of the foliar applied nutrient uptake including some details of mechanism and factors affecting uptake.
Uptake of mineral nutrients from foliar fertilization(Review) by Pawel Wojcik Journal of Fruit and Ornamental Plant Research 12:201-218 (2004) Special Ed.Probably pdf available online.
I would not suggest using foliar Nitrogen for pulses for the application of Nitrogen can stymie the biological nitrogen fixation system.
As for cereals and the ability to provide for strategic Nitrogen and Phosphorus foliarly is possible but I would not think DAP would be the best choice for this.
In terms of foliar feeding I would suggest looking at a miracle growth soluble fertilizer with complete mineral nutrition and highly soluble. For stimulating pollinization and yield application at booting stage and emerging flower head would probably have most potential impact.
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