Influence of Lime and Macronutrients on Flue-cured Tobacco in Malaysian Tropical Peat

Abstract

SUMMARYOn unlimed Malaysian peat (pH 3.5), flue-cured tobacco produced negligible leaf yields and showed no response to urea. Liming up to pH 5.25 (32 t/ha lime) linearly increased leaf yield. Tobacco responded linearly without reduced leaf quality to 90 k/ha N at pH 4.01 (8 t/ha lime), but to 45 kg/ha N at pH 4.40–5.25 (16–32 t/ha lime), higher N rates at the respective liming levels producing leaves of lower quality. The optimum rates of P and K for flue-cured tobacco appeared to be 26 and 186 kg/ha respectively, with linear responses up to those rates.

Influence of Liming and Soil pH on Cassava (manihot esculenta) in Tropical Oligotrophic Peat

“…However, in all three seasons of Expt 2, where the natural peat pH was 3.78, liming reduced tuber DM with little difference between 10 and 20 t/ha lime. These results confirm earlier reports (Edwards et al; Spain et al) that cassava is highly tolerant of soil acidity per se and on peat has proved to be more so than tobacco, Guinea grass, sorghum and groundnut (Chew et al, 1980a and1980b;W. Y. Chew et al, unpublished).…”

Liming Needs of Sweet Potato in Malaysian Acid Peat

“…Liming to raise soil pH is therefore essential to optimize yields. In these experiments, sweet potato produced optimum tuber and vine DM at pH 5.5 (Figs 4a and b) which is comparable to the pH optima earlier obtained on peat for tobacco (5.25; Chew et al, 1980b) and sorghum (5.7; Chew et al, 1981b), but appreciably higher than for pineapple (pH 3.0-3.5; Tay, 1972) and cassava (3.8; Chew et al, 1980c), while groundnut and guinea grass are intermediate in sensitivity to peat acidity (pH optima 4.6 and 4.2, respectively; Chew et al, 1980c and1981a).…”