ASSESSING CROP WATER STRESS BY INFRARED THERMOMETRY UNDER DIFFERENT SOIL MOISTURE REGIMES OF SUNFLOWER (Hellonthus annuus L)
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Date
1993
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
A field experiment was conducted on sunflower in the
rabi season of 1991 at Mahatma Phule Krishi Vidyapeeth,
Rahuri on sandy loam soil with an objects to work out the
relationship between the water use of sunflower and remotely
sensed parameters such as CATD and SDD. The efforts were
also made to determine the effect of irrigation at readily
identifiable growth stages of sunflower. The experiment was
laid out in randomized block design with five treatments
replicated four times viz. irrigation at seedling, button
formation, flowering and grain development (I1). Irrigation
at button formation, flowering and grain development (I ),
Irrigation at flowering (I3), Irrigation at button formation
and later flowering (I,), and Irrigation at 75 mm CPE d5)«
The treatment (I_) with irrigation at 75 mm CPE 5
attained the maximum height of 141.2 cm and also the maximum
dry matter accumulation of 90.5 g/plant. The treatment (I3)
with irrigation at flowering only attained the minimum
height of 77.5 cm and also the minimum dry matter accumulation of 63 g/plant. The treatment (I_) with 5 irrigation at 75 mm CPE produced the maximum yield of 1894 kg/ha and the 1„ treatment with irrigation at flowering
produced the lowest yield of 800 kg/ha.
The water management studies observed that the
highest consumptive use of 220 mm in treatment (Ic) with 5
irrigation applied at 75 mm CPE' and the maximum WUE was
recorded at 14.50 kg/ha-mm in the treatment (I.) with
irrigation applied at button formation and later flowering.
The SDD values were inversely related with the
yields. The treatment with irrigation at flowering recorded
the maximum SDD of -40°C recorded with the lowest yield of
800 kg/ha and treatment (I_) with irrigation at 75 mm CPE
which recorded the minimum SDD of -250 C with the maximum
yield of 1894 kg/ha.
The results obtained in the present investigation
revealed that the maximum yield of sunflower was produced
when the irrigation (1^) is scheduled at 75 mm CPE. The
infrared thermometry is an reliable instrument for measuring
crop water stress and use for scheduling the irrigation.
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