The effect of nitrogen-fixing bacteria in the plant Rhizosphere on the quality of forage nutrient

The presence of soil microbes around plant roots (Rhizosphere) plays a role in providing nutrients needed by plants. Research to determine the effect of nitrogen-fixing bacteria population in the plant Rhizosphere on the quality of forage nutrient. Sampling in the plant Rhizosphere: NR = Non Rhizosphere, RG = Rhizosphere Gliricidia sepium, RL= Rhizosphere Leucaena leucocephala, and RI = Rhizosphere Indigofera zollingeriana, and each treatment was repeated 7 times. Observed variables include: soil nutrient content, population microbes, nitrogen-fixing bacteria, and quality of forage nutrient. The results showed that the C-organic content of the soil in the Rhizosphere Indigofera zollingeriana (RI) treatment was 4.16% (very high) and total Nitrogen was 0.34% (moderate). The highest total microbes and nitrogen-fixing bacteria populations of 6.0 x 106 and 2.5 x 105 Cfu/g soil were found in the Rhizosphere Gliricidia sepium (RG) treatment, and the lowest results were 2.6 x 105 and 2.0 x 105 Cfu/g soil in the Non Rhizosphere (NR). The quality of forage nutrient in the Rhizosphere Gliricidia sepium (RG) treatment, produced the highest crude protein (28.56%) and the lowest crude fiber (14.41%). It can be concluded that the population nitrogen-fixing bacteria in the Rhizosphere ​​Gliricidia sepium (RG) is able to improve the quality of forage nutrient produced.