PAPER TITLE :TILLAGE PRACTICES AND RHIZOBIUM INOCULATION EFFECT ON SOIL NITROGEN AND SOYBEAN NODULATION IN SAVANNA ALFISOL OF NIGERIA

APPLIED TROPICAL AGRICULTURE | VOLUME 22 NUMBER 2 2017

Paper Details

  • Author(s) : Omeke, J.O.
  • Abstract:

Tillage and rhizobium inoculation may affect nodulation and subsequent N release to the soil, thereby influencing soil
productivity. The response of an improved soybean variety (TGX-1448-2E) on nodulation and soil nitrogen to rhizobium
inoculation under different tillage practices in a Savanna Alfisol of Nigeria was evaluated at the Institute for Agricultural
Research, Ahmadu Bello University, Samaru. Treatments consisted of two tillage systems; conventional tillage (CT) and
reduced tillage (RT) and rhizobium inoculation; [inoculated (IN) and uninoculated (UNIN)]. These were tested in a splitplot
experimental design with three replications. Data obtained were evaluated for total nitrogen (soil property), nodule
number, nodule weight, grain nitrogen, protein (plant parameters) and statistically analysed using general linear model
procedure of SAS 9.3 software. Results of soil N and protein content were higher in RT compared to CT with 3.98 % and
24.89 % differences respectively. Soil N and grain N obtained under inoculated plots were significantly higher than
uninoculated plots with differences of 44.04 % for soil N and 24.44 % for grain N. Similar observation was obtained for
protein content with 46 % difference. The results showed that RT recorded lower nodule number (34 nodule plant-1) and
lower nodule weight (239.31 mg plant-1) compared to CT with 36 nodule number plant-1 and 272.86 mg plant-1 of nodule
dry weight. The nodule number and nodule dry weights were consistently higher in inoculated plots with 89 % (nodule
number) and 68.74 % (nodule dry weight) significantly difference. These findings suggest the need for rhizobium inoculation
to improve soil N and soybean nodulation under reduced tillage practice for sustainable crop production.
Key words: Tillage, Rhizobium Inoculation, Soil N, Nodulation, Alfisol