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  1. Effect of Soil Fertility and Crop Management on Selected Soil properties and their Relationship with Yield and Water Use Efficiency Alice A. AmoahGraduate School of Agriculture Gifu University 10th February,2009

  2. Introduction • Soil fertility is a crucial factor for the successful production of any crop. • Continuous and improper use of inorganic fertilizers alone for intensive crop production can lead to soil degradation, environmental pollution and consequently lower crop yields. • Organic fertilizer improves the soil’s chemical and physical properties; resulting in good aggregate formation, water retention, good root growth for better absorption of nutrients and water for crop production. • Integrated use of organic and inorganic fertilizers can improve productivity whilst sustaining soil health and fertility.

  3. Objective • To assess the effect of supplementing chemical fertilizer with organic fertilizer on growth and yield. • To investigate the effect of combining chemical and organic fertilizer on soil properties and water use efficiency and its sustainability for crop production.

  4. Materials And Methods • Location: Gifu University Agric. Field • Design: Randomize Complete Block with Three Replication • Test crop: Hybrid Corn Variety – Gold dent KD777 • Plot size: 1.2m x 3.3m

  5. Treatments T1- No fertilizer application T2- NPK (80,130,80 kg/ha) T3- Cow dung (20t/ha) T4- 75% NPK + 25% Cow dung T5- 50% NPK + 50% Cow dung

  6. The field under preparation Cow dung

  7. Set Up Field

  8. Maize Plant at Six Weeks Old

  9. Results • Growth and Yield Components • Final Yield and Water Use Efficiency • Changes in Soil Properties

  10. Growth Components 2007 Table 2: Mean height (m) of maize at different growth stages DAS – Days After Sowing, NS - non significant

  11. Table 3: Mean number of leaves and leaf area index DAS – Days After Sowing, NS = non significant, Means followed by the same letter in a column are not significantly different.

  12. Yield Components 2007 Table 4: Number of cob/plant, grains/cob, 100grain weight and yield NS = non significant

  13. Table 5: Biomass, harvest index and water use efficiency NS = non significant,

  14. Growth Components 2008 Table 6: Mean height (cm) of maize at different growth stages DAS – Days After Sowing, Means followed by the same letter in a column are not significantly different

  15. Table 7: Mean number of leaves and leaf area index DAS – Days After Sowing, NS = non significant, Means followed by the same letter in a column are not significantly different.

  16. Yield Components 2008 Table 8: Number of cob/plant, grains/cob, 100grain weight and yield NS = non significant, Means followed by the same letter in a column are not significantly different.

  17. Table 9: Biomass, harvest index and water use efficiency NS = non significant, Means followed by the same letter in a column are not significantly different.

  18. Table 10: Initial and final measured chemical properties NS = non significant, EC= electrical conductivity, TN= total nitrogen, TC= total carbon, CEC= cation exchange capacity.

  19. Table 11: Initial and final measured physical properties NS = non significant, Means followed by the same letter in a column are not significantly different.

  20. Conclusion • Supplementing inorganic fertilizer at50% and 75% with 10t/ha and 5t/ha cow dung respectively can sustain and maintain growth and yield of crops and also improve the utilization of water by the crops. • Depending on the geographical location, texture of the soil under cultivation and the quantity of cow dung applied, combining inorganic fertilizer with cow dung at the same rate can improve the chemical and physical properties of the soil gradually over time.

  21. ThankYou