Ministry of Water Resources, Irrigation and Electricity, Khartoum, Sudan



The efficiency of the Nitrogen utilization and root nodules' life cycle in alfalfa after various mineral fertilizing and cultivation of soil methods have been investigated. The field test has been performed in the Forage Crops Institute, Pleven, Bulgaria on leached chernozem subsoil kinds and with no irrigation. The next cures have experimented: 1) for fertilization as below: N0P0K0 (controlling); N60P100K80 (an admitted technology); N23P100K35 (nitrogen has been used 1/2 in the first year of grow and 1/2 in the third year); N23P100K35 (nitrogen has been provided pre-sowing); N35P80K50, and Amophose – 250 kg/ha, estimated at fertilization rate N27P120K0; ii) for soil cultivation as below: soil losing 10-12 cm, plow at depth 12 to 15 cm, 22 to 24 cm (an admitted technologies), 18 to 22 cm and 30 to 35 cm. It has been seen that the cultivation of soil and mineral fertilizing had an impact on nitrogen utilization efficiency and the root nodules' life cycle in Alfalfa. Nitrogen utilization efficiency has been discovered for being maximum at N23P100K35 and plow at the depth of 22 to 24 cm. The root nodules' life cycle has been the longest at N35P80K50 and plows at the depth of 18 to 22 cm. The more useful root mass for nodule number ratio has been seen at N23P100K35 and plow at the depth of 22 to 24 cm.


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