Soil Test and Nitrogen, Phosphorus and Potassium Requirement of Maize in Southwestern Nigeria.

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dc.contributor.authorAdebusuyi, Benson Adekunle
dc.contributor.otherAduayi, E.A.
dc.contributor.otherSobulo, R.A.
dc.coverage.geographicalSouthwestern Nigeriaen_US
dc.date.accessioned2014-07-04T08:58:46Z
dc.date.accessioned2018-10-27T13:57:16Z
dc.date.available2014-07-04T08:58:46Z
dc.date.available2018-10-27T13:57:16Z
dc.date.issued1985
dc.degree.awardPH.D. Soil Scienceen_US
dc.departmentSoil Scienceen_US
dc.description.abstractSoil testing as a fertilizer advisory service to farmers is not common in Nigeria. Method of sample treatment and time of sampling in relation to fertilizer treatment need to be properly established. In order to shorten the time required for analysis, a multi-element extractant has to be developed to cover more than one element at a shaking time. This study was undertaken to evaluate suitable and rapid methods for a soil testing programme. Simultaneous extraction of P and K at a shaking time of 5 minutes was carried out. Bray II was recommended for the simultaneous extraction of P and K. The field trial was conducted at five locations viz: Ikenne, Akure, Agbede, Ilorin and Ilora. Available nitrogen, NO3-N was the best index of N availability in soil for short period of four weeks but the poorest under continuous cropping. Soil N critical levels were established with deficient values of 20 ppm NO3-N, 0.05% total N and 0.7% carbon while the critical values were 30 ppm NO3-N, 0.11% total. N and 1.26% carbon. Field correlation and calibration studies was used to establish soil critical P and K. Maize responded to N fertilizer at Ilorin, a savanna zone up to 150 Kg N/ha but lower response to N was observed in forest zone. The critical soil P levels at about 90% relative yield in the field and glasshouse were 9.5 and 12 ppm P while the corresponding deficient levels at 50% relative yield were 6 and 7.5 ppm P respectively. The critical soil K by Bray I, Bray II and NH4 0AC in the field study was higher than greenhouse value with a range of 0.33 - 0.38 me K/100g. The critical N, P and K concentration in maize leaf. The tissue at four and eight weeks stage were compared. The relationship between the tissue content at four weeks and relative yield was better than at eight weeks while the critical values were 3.2%, 0.4% and 3.9% N, P and K at four weeks respectively and 2.80%, 0.29% and 2.50% N, P and K for eight weeks respectively.en_US
dc.facultiesAgricultureen_US
dc.format.filetypepdfen_US
dc.identifier.citationAPAen_US
dc.identifier.urihttp://localhost:8080/xmlui/handle/123456789/2624
dc.language.isoenen_US
dc.pages.totalpages194pen_US
dc.publisherObafemi Awolowo Universityen_US
dc.subjectFertilizeren_US
dc.subjectSoil testen_US
dc.subjectExtractionen_US
dc.subjecttissue testingen_US
dc.titleSoil Test and Nitrogen, Phosphorus and Potassium Requirement of Maize in Southwestern Nigeria.en_US
dc.typeThesisen_US
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