Browsing by Author "Jones, P. A."
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Item Coffee Board of Kenya Monthly Bulletins February 1956(1956) Jones, P. A.; Pereira, H. C.; Coffee Board of KenyaThe problems to be studied.-The main coffee-producing areas of Ken a lie on the south-east slopes of the Aberdare range.The soils are very deep, friable, lateritic clays, derived from festive sheet lava and classified as the Kikuyu Red Loam series.The lava has been dissected by streams into characteristic steep-sided ridges.Most of the /plantations were established in the early years of the present century,the trees being planted in straight lines without regard to the contours, so that cultivation has been up and down slopes which sometimes exceed 20 per cent. Although these soils are inherently stable sheet-erosion has been general and lying has occurred on many plantations.This erosion has taken place mainly the hotter and drier areas below an altitude of about 6,000ft. Here coffee is grown without shade protection, and thirds of the soil surface is exposed alternately to severe desiccation and to the impact of tropical rainstorms. The steady decrease in the supply and reliability/y of manual labour intensifies the dahgel1s of soil erosion, as the coarse cloddy tilth of the hand-hoe is replaced by continuous off-contour furrows of the disk harrow or plough.Item Irrigation Experiments at the Coffee Research Station, Ruiru, Kenya(1957) Wallis, J. A. N.; Jones, P. A.Irrigation practice in coffee was reviewed by the staff of this Research Station towards the end of 1954 [1]. At the same time every aspect for investigation was considered and the proposed experimental programme was tabled for discussion by the Standing Coffee Research Advisory Committee. It was agreed that the basic problems in need of study, which could be incorporated in any long-term trialsItem Response of Mature Napier Crass to Fertilizers and Cattle Manure in Kenya(1965) Jones, P. A.; Robinson, J.B.D.; Coffee Research Station: Agriculture and Forestry Research OrganizationTrials with Napier grass grown for mulching were conducted from 1951 to 1959 on two similar and adjacent soil types. On the more fertile soil no consistent response was recorded to nitrogen or phosphorus fertilizers applied seasonally and annually. Cattle manure at 20 tons/acre annually, raised yields consistently. Grass grown on the less fertile soil responded to double superphosphate and basic slag (42 lb. p2p5 per acre annually) and there was a positive NP interaction with superphosphate although nitrogen alone gave no yield increase on either soil type.Item Response Of Mature Napier Grass To Fertilizers And Cattle Manure In Kenya(1965) Jones, P. A.; Robinson, J. B. D.Trials with Napier grass grown for mulching were conducted from 1951 .to 1959 on two similar and adjacent soil types. On the more fertile soil no consistent response was recorded to nitrogen or phosphorus fertilizers applied seasonally and annually.
