Soil Amendment with Graded Levels of Craseonycteris thonglongyai compost on the Concentrations of some Phytotoxins in the Leaf of Cnidoscolus aconitifolius (Tree Spinach)
doi.org/10.26538/tjnpr/v6i2.15
Abstract
Generally, the nutrients and phytotoxins content in plants are influenced by physicochemical
properties of the soil among other environmental factors. It is for this reason that pot experiment
was conducted to investigate the influence of different levels of Craseonycteris thonglongyai
compost on the concentrations of cyanide, nitrate, saponin, tannin, phytate and oxalate in the
leaves of Cnidoscolus aconitifolius. The different levels of C. thonglongyai compost used were
control (0 g), 25, 50, 75, 100 and 125 g per 20 kg soil. The leaves of C. aconitifolius were
harvested at vegetative phase and subjected to standard analytical methods. The concentrations
of oxalate and phytate were evaluated using titrimetric method while concentrations of nitrate,
saponin and tannin were determined using spectrophotometric method. The results showed that
application of C. thonglongyai dung significantly (p < 0.05) decreased the concentrations of the
phytotoxins. Cyanide and phytate contents in the vegetable decreased with the application of
various levels of the compost. Whereas moderate application of the compost had no significant
effect on the concentrations of nitrate, saponin, tannin and oxalate, the concentrations of these
phytotoxins increased significantly with increase in the application of the C. thonglongyai
compost, particularly from 75 to 125 g per 20 kg soil. The study concludes that moderate
application of C. thonglongyai dung particularly that of 50 g per 20 kg soil improves the
nutritional quality of C. aconitifolius, as this quantity of the dung does not increase the
concentrations of the plant toxins evaluated in the vegetable except the nitrate content.
Keywords: Soil Amendment, Cnidoscolus aconitifolius, Phytotoxins, Craseonycteris
thonglongyai compost.
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