Yield and Water use Response of Watermelon under Deficit Irrigation and Mulch

Description

– Yield and Water use Response of Watermelon under Deficit Irrigation and Mulch –

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Abstract

A field experiment was carried out from Feb-May 2012 at the irrigation Research Farm, Institute of Agricultural Research, Samaru, to determine the yield and water use response of watermelon under Deficit irrigation and mulch.

The experiment consisted of four levels of irrigation water application depth of 100% (I₁₀₀), 75% (I₇₅), 50% (I₅₀) and 25% (I₂₅) replacement of moisture depleted and three mulch types (Rice straw mulch M_RS, Black polyethylene mulch M_BP, and No mulch M_NO) giving a total of 12 treatments laid in a randomized complete block design(RCBD).

Water was applied to each basin using a calibrated short length PVC pipe serving as an orifice installed in each basin. The soil moisture was monitored throughout the crop growing season with gypsum block installed at three different depths (0 -15, 15 – 30 and 30 – 45 cm) below the soil surface.

The experimental crop was watermelon, which was harvested at maturity, and then the fruits were counted and weighed.

The yield obtained ranged from 7.38 t/ha to 58.49t/ha. The least yield value was obtained from the treatment with irrigation at 25% replacement of moisture depleted and No mulch (I₂₅M_NO) while the highest yield value was obtained with irrigation at 50% replacement of moisture depleted and black polyethylene mulch (I₅₀M_BP).

Introduction

1.1 Background of the Study

Irrigation scheduling is commonly defined as determining when to irrigate and how much water to apply. Successful irrigation depends upon understanding and utilizing irrigation scheduling principles to develop a water management plan.

Effective irrigation scheduling provides information to irrigation scheme managers for use in developing irrigation strategies on each field for efficient irrigation.

Scarce water resources and growing competition for water reduce  its availability for irrigated agriculture. Achieving high water use efficiency is a primary challenge in irrigated agriculture.

Irrigation practices and techniques aimed at maximizing crop production with minimum water utilization are fast evolving, and there is need for evaluation of these practices before adoption, which include the employment of techniques and practices that deliver a more accurate water supply to crops. (FAO, 2002, English and Raja 1996).

Studies are needed to increase the efficient use of the available water. Regulated deficit irrigation with mulching is one among many practices that is fast gaining ground, and it appears a very promising option at achieving the goal of more crops per unit volume of water, if properly adopted.

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