Effect of different nutrition systems (chemical, organic and biological) on forage yield and quality of three grasspea (Lathyrus sativus L.) lines

To evaluate the effect of different nutrition systems (such as organic, chemical and biologic) on quantitative and qualitative traits of three selected lines of grasspea (Lathyrus sativus L.), a field experiment was conducted at College of Agriculture, Tarbiat Modares University during 2012-2013 growing season. The Experimental treatments were arranged as factorial layout based on a randomized complete block design with three replications. The first factor was three grasspea lines (L1 (Sel.B/222), L2 (Sel.B/111) and L3 (Sel.290)) and the second factor was four nutrition system (no fertilizer (F0), 100% chemical fertilizer (F1), 100% manure (F2) and integrated fertilizer (75% manure + 25% Nitroxin (F3)), respectively. Results showed that L1 (Sel.B/222) receiving 100% chemical fertilizer produced maximum forage yield (20145.8 kg.ha-1), whereas the integrated nutrition system (75% manure + 25% Nitroxin) produced the highest dry forage yield (3005.3 kg.ha-1). Integrated nutrition system (75% manure + 25% Nitroxin) having the highest percentage of dry matter digestibility, the highest protein percentage and the lowest ADF was the superior treatment in forage quality. L1 (Sel.B/222) grasspea treatment was superior in maximizing the percentage of dry matter digestibility and minimizing the percentage of ADF. The grasspea line L3 (Sel.290) produced the highest percentage of protein. The lowest crude fiber content of grasspea forage was achieved in L3 (Sel.290) under integrated nutritional system. Thus, the combined system of L1 (Sel.B/222) and F3 (75% manure + 25% Nitroxin) is a good alternative or chemical fertilizers and could be suggested for qualified and higher forage yield of grasspea.