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Effect of Water Stress in Terms of Solar Radiation (0.60 Mj M-2) and Nutrient Solution Electrical Conductivity on Water Relations of Rice

K P Halder
Farm Management Division, BRRI

S W Burrage
Imperial College, UK

Abstract/ Executive Summary:

An experiment was carried out in the glasshouse unit of the Imperial College at Wyc, University of London , UK during May to November 1999 to find out the effect of intermittent water stress and nutrient solution EC on water relations, transpiration rate and leaf temperature of rice plant. Two levels of intermittent water stress (CC = continuous circulation of nutrient solution throughout the life cycle and RS = water stress was imposed from panicle initiation to maturity) and two levels of nutrient solution EC (3.0 mS cm-1 and 2.0 mS cm-1 ) were used. Rice plants were grown using nutrient film technique (NFT). Nutrient status of the solution was maintained by adjusting solution EC and water stress was imposed by withholding circulation of the nutrient solution until the plants had received 0.60 MJ m-2 solar radiations. Water stress significantly decreased water uptake by the plant. The leaf water potential (?), relative water content (RWC) and water use efficiency (WUE) of plant were not significantly affected by water stress. Water stress significantly decreased leaf transpiration rate but increased leaf temperature. Nutrient solution EC did not affect water uptake, ?, RWC, WUE, leaf transpiration rate and leaf temperature.

Keywords: Water stress, Solar radiation,Nutrient solution, Electrical conductivity, Water relations of rice

Location: Glasshouse of Imperial College at Wye, University of London, UK

Start Date: 01-05-1999

End Date: 30-11-1999

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

For better understanding about water deficit effects on water relations in rice.

Methodology:

The experiment was conducted in the glasshouse of Imperial College at Wye, University of London, UK during May to November 1999. Two levels of intermittent water stress treatments (CC = continuous circulation of nutrient solution throughout the life cycle and RS =water stress was imposed from panicle initiation to maturity) and two levels of nutrient solution EC (3.0 mS cm-1 and 2.0 mS cm-1 ) were used. Treatments were replicated four times in a randomized complete block design. Seeds of BR24 were germinated in an incubator at 30°C for two days. After germination, the individual seeds were placed in small wetted rock wool cubes (2.54 x 2.54 x 3.80 cubic mm). The cubes were placed in trays in a glasshouse at a temperature of 26°C day and night. After 5 days, when the seedlings had reached 3-4 cm height, they were given equal amount of the mixture of I% stock solution A and I% stock solution B of Wye nutrient solution (Varley and Burrage, 1981 ). After 10 days when the seedlings had reached 15-16 cm height, they were chosen for uniformity and transferred to larger rock wool cubes (I0 x I0 x 6.5 cubic mm). Then the plants were transferred to the NFT system. The plant spacing was 20- x 20 cm. Twelve plants were accommodated in each gully of the NFT system. Two plants at the end in each gully were considered as guard row plants. Tap water was circulated through the gullies for three days to encourage root growth and development before adding the nutrient solution. After that 50% plants were grown in a nutrient solution of EC 3.0 mS cm-1 and other 50% plants in a nutrient solution of EC 2.0 mS cm-1. The solution pH was maintained at 5.5-6.5 by using 5% acid mixture of nitric and orthophosphoric acid (3: 1 ). The nutrient solution EC and pH were measured and adjusted daily using an EC meter. Ventilation of the cubicle was set at 29°C. Day and night temperatures were set at 27°C and 21°C, respectively. The water stress treatments were adjusted by controlling the period between recirculation of the nutrient solution by means of a computer connected to a tube radiometer. The total radiation received within the glasshouse was integrated and the pumps were switched on for fifteen minutes after a fixed amount of energy (0.60 MJ m-2 ) received according to the treatments.

Source of Information: Bangladesh Rice J . 13 (1): 63-67,2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Water stress significantly reduced water uptake but the effect of EC and the interaction between EC and water stress was not significant on water uptake by the plant. The effect of EC, water stress and their interaction was also insignificant on ?, RWC and WUE because during non-circulation period (2-3 hours , depending upon the intensity of solar radiation), the plants absorbed water from the rock wool cubes and root mats. At the end of stress period the amount of water in the rock wool cubes and root mats decreased but was not completely dry though it did not decrease significantly.

Knowledge Management: Journal