Growth responses of green mustard (Brassica juncea) and water spinach (Ipomoea aquatica) in terms of water productivity and yield based on Cropwat 8.0 with limited data availability in a semi -arid developing nation

KOEHUAN, Jonathan Ebet (2023) Growth responses of green mustard (Brassica juncea) and water spinach (Ipomoea aquatica) in terms of water productivity and yield based on Cropwat 8.0 with limited data availability in a semi -arid developing nation. Growth responses of green mustard (Brassica juncea) and water spinach (Ipomoea aquatica) in terms of water productivity and yield based on Cropwat 8.0 with limited data availability in a semi -arid developing nation, V.50 (5). pp. 9-20. ISSN 2539-6161

Text LAMP V.4. JUR INT REPUTASI EASR-2.pdf Download (3MB)

Abstract

The crop water requirement (CWR) is one of the most important aspects to consider when studying food production under the types of water scarcity constraints that are widely encountered in semi-arid regions. Better CWR predictions lead to better irrigation applications when studies are hampered by inadequate data and expertise. The aim of this work is therefore to predict the irrigation requirements, variate the irrigation application, to determine and model the crop growth and production responses, and subsequently assess the crop water productivity. In this research, we input climate, crop and soil data and certain strong assumptions to FAO-Cropwat Version 8.0 to predict the CWR. Green mustard (Brassica juncea) and water spinach (Ipomoea aquatica) were cultivated in polybags with limited handling, and irrigated with variations in the predicted CWR. The crop height, number of leaves, and fresh weight were measured and used as input to a crop-water response model using the response surface methodology. The water productivity (WP) was then used to quantify the crop-water relationship. The results showed that these two small vegetables showed similar effects from irrigated water on the crop height, with a slightly different effect on the number of leaves, and different effects on the fresh weight. The models fitted the reduced quadratic model, and were considered to be valid. The most significant components of our model were the potential evapotranspiration (ETo), available water (AVW), and the interaction between ETo and AVW, which showed saddle responses with maximum and minimum effects. The WP for green mustard was higher than for water spinach. The highest WP for both crops was achieved when they were irrigated with a reduction of 50% from the predicted CWR. In these research conditions, we recommend taking advantage of FAO- Cropwat version 8.0 for a reduction in irrigation water application. We also suggest further experiments with crops cultivated in fields.

Item Type:	Article
Uncontrolled Keywords:	Crop water requirement, FAO-Cropwat version 8.0, Response surface methodology, Water productivity, Semi-arid region, Small vegetables
Depositing User:	Mr Admin UKAW
Date Deposited:	19 Jan 2024 01:02
Last Modified:	19 Jan 2024 01:02
URI:	http://repo-ukaw.superspace.id/id/eprint/3207

Actions (login required)

View Item