The mucuna module was developed by Michael Robertson. The reader is referred to the science document for the plant module for a comprehensive description of the processes simulated by APSIM-Mucuna. The paper by Robertson et al. (2004) outlines the science content of the module, and some testing in Malawi. This document outlines some mucuna-specific issues that are not covered by the plant science document.
Notable features of APSIM-MUCUNA
The module simulates the main variety grown in southern Africa – Kalagonda
The module does not simulate production from second and further flushes of flowers and pods.
APSIM-Mucuna is not phosphorus-responsive, this is currently under development.
Crop growth is not sensitive to waterlogging.
Cultivars and crop classes
There is one crop class.
There is one cultivar able to be simulated: mucuna_gen. This cultivar is typical of that found growing under smallholder conditions in southern Africa.
APSIM-Mucuna has received testing in Malawi only, with factors such as sowing date and soil types. Table 1 summarises module performance reported by Robertson et al (2004).
Table 1: Observed (O) and simulated (S) biomass at flowering and maturity and grain yield for velvet bean crops used for model testing. All variables are in kg/ha.
|Biomass N at maturity||Grain N at maturity||Biomass at flowering||Biomass at maturity|
a=days after sowing of maturity harvest
b=crop at Chitala suffered late leaf diseases, therefore only sampling at flowering is recorded
c NM=not measured
In which environments should this module be used with confidence?
APSIM-Mucuna can be used with most confidence in southern Africa. No testing has been done elsewhere.
MJ Robertson, Sakala W, Benson T, Shamudzarira Z (2004) Simulating response of maize to previous velvet bean (Mucuna pruriens) crop and nitrogen fertiliser in Malawi. Field Crops Research (in press).