Compromising with Expensive NPK Fertilizer by Cheapest Farmyard Manure with respect to the Yield Components of Black gram (Vigna mungo L.) Hepper

Abstract

A laboratory experiment was conducted in Jinnah University for women, Karachi to evaluate the manural potential of farmyard manure (FYM), vis-a-vis 25%, 50% and 100% doses of commercial rate NPK (i.e 120:60:30) to find out the most productive cropping system at various strength of chemical fertilizers and organic manures with respect to the growth of black gram (Vigna mungo L.). Experiment comprised NPK @ 120:60:30 kg ha-1, and NPK @ 100:50:50 kg ha-1 along with FYM @ 5 t ha-1. NH4NO3, CaHPO4. 2H2O, KCL were used as sources of N, P2O5 and K2O respectively. All the growth parameters including Shoot length, Root length, Shoot fresh weight, Shoot dry weight, Root fresh weight and Root dry weight of Black gram was recorded highest at 25% NPK (1/4th strength). Application of FYM @ 5 t ha-1 was favored at both strength 1/4th and 1/2th NPK and produced significantly higher growth than all the other single treatments. Therefore, it has been realized that the integrated use of organic and inorganic fertilizers could produced sustainability in intensive production system and improve crop yield and productivity.