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Long term effects of nitrogenous fertilizers on tea yields, nutrients uptake and some soil chemical properties

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dc.contributor.author DM Kamau, PO Owuor, JK Wanyoko
dc.date.accessioned 2020-07-30T08:55:22Z
dc.date.available 2020-07-30T08:55:22Z
dc.date.issued 2005
dc.identifier.uri https://repository.maseno.ac.ke/handle/123456789/1728
dc.description The article can also be accessed via;https://agris.fao.org/agris-search/search.do?recordID=KE2007200146 en_US
dc.description.abstract A field experiment was set up to determine long tenn responses of different rates of nitrogen fertilizers namely used in tea, N~KS 25:5:5:5 and NPK 20: 10: 10, on tea 'Ields, nutrient uptake and soil chemical properties. The experiment also aimed at establishing whether tea plant would benefit nKJrefrom NPK20: 10: 10 or NPKS 25:5:5:5 fertilizer formulation. Mean tea yields and eafnitrogen over the sixteen year period, 6 to 2001, were not affected by ferti lizer :ormulation. Similarly, leaf sulphur content ,as unaffected by fertilizer type. However, ,jf and soil phosphorus and potassium 1ntents were significantly higher in the WK 20: 1 0: 10 formulation compared to WKS 25:5:5:5. The NPKS 25:5:5:5 mnulation acidified the soil more than the WK20:1O:1O at up to the 60 cm depth. Soil ,iailable phosphorus and potassium were :i!her in the NPK 20: 10: 10 fertilizer at all dour depths. Nitrogen fertilizer rates gave significant Jadratic yield responses with peak yields .the 300 kgN ha-I rate in both fertilizer 'xs, Nitrogen uptake from the leaf nutrient :~had a similar pattern and indicated that :vond the 300 kgN ha.1 rate, the nitrogen ,elsdld not change implying that the extra qgenadded was not utilized as efficiently mttea plant. While leaf phosphorus and ,1,1ssJUm decreased in a quadratic manner :h mtrogen fertilizer rates, leaf sulphur lent was not affected. The implications Jsmg either of the two fertilizer "1ulations m tea production are discussed. en_US
dc.publisher Soil Science Society of East Africa en_US
dc.subject tea; soil physics; fertilizer application; nitrates; Kenya en_US
dc.title Long term effects of nitrogenous fertilizers on tea yields, nutrients uptake and some soil chemical properties en_US
dc.type Article en_US


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