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Agriculture and Environmental Science Academy (AESA) is a registered under the societies registration act XXI of 1860 with its head office in Haridwar (Uttarakhand), India. AESA is a non- profit organization and is an interdisciplinary research organization and it’s dedicated for issues in the field of social, environment and agriculture development. It has been established for providing a wide range of social activities, environmental awareness, sustainable agriculture, educational work in the field of pollution, health, sanitation, forest, wi [...]

Journal Article

Journal article

Using the DSSAT-CROPGRO model to simulate gross margin and N-leaching of cowpea fertigated with human urine  [2020]

Lomeling, David; Huria, Joseph;

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This study simulated the biophysical, economic and environmental implications of cowpea fertigated with human urine (equivalent to 60 kg N ha-1) as source of organic N. The DSSAT CROPGRO model was used to simulate harvested cowpea yield, N(leached), N(uptake), monetary returns or gross margins in ($) under two different treatments: without fertigation or human urine (T0) and with fertigation (T1). Biophysical analysis using the Cumulative Probability Distribution (CPD) showed a 50% probability of the harvested cowpea yield under T1;being higher than under T0;at 1060 and 600 kg ha-1;respectively, accounting for a 43.4% difference.; The Mean Gini Stochastic Dominance (MGSD) analysis was used to assess the gross margin and helped in deciding on the best strategic and management option. The findings of this study revealed a 50% probability (CPD0.5), of higher gross margin under T1;at $ -215 higher than under T0;at $285. This was a $70 difference per season under T1;and so enhancing a faster payback and a larger monetary return on overall investments. Similarly, seasonal analysis with fertigation showed that at CPD0.5, the N(leached);was still < 4 kg N ha-1;per season and so posed no environmental risks. The simulation results also showed higher a probability of N(uptake);of about 270 kg N ha-1;during fertigation compared to about 95 kg N ha-1;under T0.; Therefore, the DSSAT CROPGRO model can be used to successfully forecast future cowpea yields, gross margin,
N(leached), N(uptake);under different management practices to enable smallholder farmers in South Sudan make informed decisions on sustainable cowpea production.

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Archives of Agriculture and Environmental Science

ISSN : 2456-6632