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University of Gezira (2015)

Irrigation Water Productivity for the Intercropping of Pigeon Pea [Cajanus cajan (L.) Millsp] and Sweet Pepper (Capsicum annuum L.) on Clay Soil, Gezira State, Sudan

Aburigal, Ilham Adam Ali

Titre : Irrigation Water Productivity for the Intercropping of Pigeon Pea [Cajanus cajan (L.) Millsp] and Sweet Pepper (Capsicum annuum L.) on Clay Soil, Gezira State, Sudan

Auteur : Aburigal, Ilham Adam Ali

Université de soutenance : University of Gezira

Grade : Doctor of Philosophy,in Environmental Science and Natural Resources 2015

Résumé
The concept of water productivity in agricultural production system is emerging at present as useful measurement of irrigation water potentiality since it relates the yield of the crop to irrigation water applied. However, water is a limiting factor for agricultural production in dry zones that are characterized by high rate of evaporation and evapotranspiration. One of the mechanisms of reducing reference evapotranspiration ; is growing tall crops in combination with short crops. Therefore, the objective of this study was to compare the irrigation water productivity and economic water productivity of various combinations of Pigeon Pea [Cajanus cajan (L.) Millsp.] and Sweet Pepper (Capsicum annuum L.) under the dry land conditions of central Sudan. The research study was conducted at the farm of the Faculty of Agricultural Sciences of the University of Gezira for two consecutive winter seasons, 2010/2011 and 2011/2012. Pigeon Pea was planted on ridges laid in east to west direction. Planting was made at two spacing ; every 20-cm and 40-cm distance between the plants. Planting of Pigeon Pea was arranged at distances between rows viz with every other ridge, every two ridges and every three ridges. Sweet Pepper was planted between Pigeon Pea rows according to the recommended technical package. The treatments were replicated three times. Irrigation water was measured using a calibrated current meter for each plot. There were 18 irrigations per season and 18 readings per irrigation over the two seasons, 648 readings were taken, with an accuracy ±5 to ±10%. Soil moisture before planting and after last harvest was measured gravimetrically. There were 360 soil samples of soil moisture taken over the two seasons and the accuracy was ± 0.2%. Length of the shade cast by Pigeon Pea was calculated using height of Pigeon Pea and zenith angle of the sun four times a day in the middle of each month for 10 months in the two seasons. The results obtained reveled that planting of Pigeon Pea at every three ridges and growing of Sweet Pepper between gave the highest irrigation water productivity (0.34 kg/m3) and economic water productivity (2.26 SDG/m3). From the results of the study it can be concluded that growing of Sweet Pepper between rows of Pigeon Pea arranged in every three ridges is recommended as far as the conditions of the study were considered.

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