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Title: Effect of Chickpea(Cicer arietinum L. cv. kabuli) and common beans (phaseolus vulgaris L. cv. rose coco)on wheat performance and soil fertility in a legume-wheat cropping sequence
Authors: Guto, Nyachio,Samuel
Keywords: Soil fertility
Issue Date: 1997
Publisher: Egerton University
Abstract: Soil fertility is one of the most serious problems that limit wheat productivity. This is partly caused by wheat monocropping which leads to nutrient depletion especially nitrogen, which limits wheat productivity when in short supply. Legumes when incorporated into cropping systems improve soil fertility through their nitrogen fixing ability and consequently increase the yields of subsequent crops. Thus a study on the effect of two pre-wheat legumes (chickpea and beans) on wheat performance and soil fertility was conducted in the Egerton University, Agronomy ‘field, during the short rain season of 1995/96 and the long rain season of 1996. Two‘ cropping sequences, (C-W) and (B-W) were compared to (F-W) at the 0, 30 and 60 Kg N/ha rates of N application. The percent total N in wheat plants at dilferent stages of growth, available N at three depths (0-15, 15-30 and 30-60 cm) and microbial biomass at 0-15 and 15- 30 cm depths were monitored. Incubation studies to determine potential N mineralization of the soil were also conducted in the laboratory for a period of 90 days. The results showed that cropping sequences had significant effect on wheat DM yield but not on the gain yield. The different rates of N application on the other hand had significant effects on the gain and DM yields. The fenilizer replacement value for C-W was 39.7 Kg N/ha whereas that for B-W was 24.0 Kg N/ha. The total N in wheat gains and straw increased with increase in the rate of N application but still B-W and C-W cropping sequences had higher total N levels than F-W. However the total N content in wheat plants at different stages of gowth declined fi'om seedling to harvest due to either dilution elfect as more plant biomass was produced or translocation of nitrogen to newly fomied plant parts such as the grains . The C-W and B-W cropping sequences generally had higher levels of available N in the soil compared to F-W except at wheat planting and the rates of N application showed significant treatment effect on available N as fiom 30 DAS till harvest.
Appears in Collections:Faculty of Agriculture

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