Yield response of tobacco to different levels of nitrogen and potassium on alluvial soil in Kelantan

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A.C. Leong

Abstract

All the treatment combinations yielded significantly higher compared to the control. The yield response to nitrogen was linear. The level of nitrogen at 50.4 kg ha-1 yielded significantly higher than the levels of 33.6 to 44.8 kg ha-1 with no significant differences between N treatments up to 44.8 kg N ha-1. No deterioration of the visual quality of the cured leaves was observed at 50.4 kg N ha-1. No significant yield difference was detected between the different levels of potassium. The best treatment combination was a1 39.2 kg N ha-1 and 168.1 kg K2O ha-1 which approximated to the value obtained from differentiation of the multiple regression equation.

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The use of tapioca in broiler diets

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S.W.Yeong and Syed Ali, A.B

 Abstract

Five experiments were conducted to study the possibility of replacing maize with tapioca chips in broiler-finisher diets.In the first two trials,five isonitrogenous and isocaloric diets with graded levels of ground tapioca chips (0%, 15%, 30%, 40% and 50%) substituting maize, were fed to commercial broiler chickens from 5th to 10th week. It was observed that as the tapioca levels increased, the body weight and feed efficiency decreased linearly (P<0.01) although the essential amino acids content in all the diets were as high as the requirement levels.Pelleting the tapioca diets slightly improved feed efficiency but could not overcome the adverse effect completely. In the subsequent trials, diets with graded levels of tapioca were supplemented with different levels of methionine. The results showed that 40& or 50% tapioca supplemented with 0.2% methionine were comparable to maize control diet in terms of body weight gains and feed efficiency. No significant difference was found in carcass of broilers fed maize and tapioca diets in terms of percentage of ready-to-cook and meat to bone ratio. Absence of yellow pigment in the skin, shanks and depot fat was observed in broilers fed high tapioca diets.

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Ruminant faecal fat of tropical sheep

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C. Devendra

Abstract

The daily faecal fat production of indigenous sheep of Malaysia fed a low-fat diet (0.9 per cent ether extract) was found to be 234.0 mg/kg live weight, which compares with 274.7 mg/kg live weight for Barbados Blackbelly sheep. Since both values are higher than those reported for temperate sheep, it is suggested that tropical sheep produce relatively higher faecal fat, mainly of endogenous origin. This point is also consistent with the finding that relatively higher proportions of palmitic and stearic acids were also excreted.

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The total and extractable contents of five trace elements of some soils of Malaysia

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A.B. Othman1, H. Eswaran2 and A Cottenie3

Abstract

Soils on basic igneous rocks from Malaysia were investigated to evaluate the total and extractable trace element contents and their variation as a function of organic carbon and evolution of the soil. The soils are considered according to their genetic groups. In the Dystropepts, the extractable trace elements are strongly correlated to organic carbon content. As a function of soil formation, the Dystropepts have the highest extractable trace elements and the Oxisols the least. Only total Zn shows any evolutionary sequence; the other total elements are relatively constant and change little with soil formation. A fixation mechanism wherein both the type of clay minerals and perhaps sesquioxides play a role is suggested to explain the decrease in some of the extractable elements with progressive evolution of the soil.

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Characterising two F1 lines pineapple ananas comosus,L. (Merill)

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C. K. Lee

Abstract

Two lines possessing desirable agronomic characters such as golden flesh colour, large fruit size and cylindrical shape have been isolated in the F1 generation of the crosses using a Singapore Spanish and Smooth Cayene/Sarawak as the parents. 

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