Optimization of land productivity in Zanzibar through intercropping of cassava (Manihot esculenta Crantz) and sweet potatoes (Ipomoea batatas L.Lam)
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Date
2020
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Publisher
Sokoine University of Agriculture
Abstract
Two field experiments were conducted during the growing season of 2018/2019 at
Zanzibar Agricultural Research Institute (ZARI) Unguja and Pemba. The objective of the
experiment was to explore the potentiality of optimizing land productivity through
intercropping cassava with sweet potato on limited land available. The experiment was a
split-split plot laid out in a randomized complete block design (RCBD) with four
replications. Improved cassava variety 'Kizimbani' was intercropped with improved sweet
potato variety 'Mayai'. The main plot was intercropping time of sweet potato. Fertilizer
application was a sub plot and sweet potato intercrop plant density of 10 000, 20 000 and
30 000 plants ha-1was a sub-sub plot. There were 48 intercropped plots and 32 sole-cropped
plots. Data on crop establishment, plant height, canopy dimension, foliage cover, vine
vigour, root/tuber yields and number of roots/tubers were collected and subjected to
analysis of variance (ANOVA). The results revealed that there were significant differences
between treatments in crop yields, vine vigor, plant height, foliage cover, canopy length,
thickness and number of marketable roots/tubers. Furthermore, there were significant
differences in the two sites in most of the observed characteristics. Matangatuani gave the
highest yield of cassava (17.63tha-1) in intercropping compared with Kizimbani
(13.15tha-1). However, for sweet potato, Kizimbanirecorded14.67tha-1 and
Matangatuani13.75tha-1.In addition, intercropping of cassava with sweet potato gave the
highest land equivalent ratio (LER) of 1.75 in combined site analysis. This indicated that
the greatest productivity per unit area was achieved by growing the two crops together.
Description
Masters Thesis
Keywords
Cassava, Fertilizer, Intercropping, Planting time, Spacing, Sweet potato, Manihot esculenta Crantz, Ipomoea batatas L.Lam, Zanzibar