Abstract
The results of this study revealed that the pan evaporation and sensor based irrigation scheduling along with fertigation scheduling significantly affected the plant height, fruit weight, fruit length, crop water requirement, crop yield and water use efficiency of okra crop. The pan evaporation and crop evapotranspiration (ETc) values significantly vary over different stages of okra crop. The maximum and minimum average daily pan evaporation was recorded 8.4 mm day-1 and 4.5 mm day-1 at mid stage and late stage of okra crop respectively while, the maximum average daily ETc was recorded 7 mm day-1 at mid stage of okra crop. A approach of irrigation scheduling with 100 per cent field capacity, based on soil moisture sensor under automated drip irrigation system along with 100 per cent RDF through fertigation in equal splits at 4 day intervalor 80 % per cent of volume of crop water requirement based on pan evaporation under automated drip irrigation along with 100 per cent RDF through fertigation in equal splits at 2 day interval, can be used for irrigating okra crop with significant water saving, crop yield and water use efficiency under limited availability of daily weather datain climatic condition of Udaipur district of Rajasthan.
Highlights
Nowadays, the sector that consumes the major amount of fresh water in India is agriculture, and due to the limitation and scarcity of fresh water resources, it is necessary to manage irrigation rationally and emphasize on the selection of most appropriate method of irrigation scheduling for irrigating the crops under drip irrigation, so they can work more efficiently, minimizing waste in irrigated agriculture (Farias et al 2017)
In this study MAHY-28 variety of okra crop was sown on February 27, 2019 and crop water requirement was calculated by pan evaporation data and soil moisture sensor data on daily basis
It is mainly due to high atmospheric temperature as well as average daily pan evaporation at mid stage (Fig 1) and there is only negligible availability of effective rainfall during (28.8 mm) at late stage of okra crop
Summary
In this study MAHY-28 variety of okra crop was sown on February 27, 2019 and crop water requirement was calculated by pan evaporation data and soil moisture sensor data on daily basis. The meteorological data such as temperature, relative humidity, wind speed, rainfall, pan evaporation and sunshine hours during the crop period was acquired from the meteorological observatory located at Instructional Farm, , Udaipur. The crop coefficient, Kc values of okra crop for Udaipur region (Anon., 2019) was taken (Table 1).The pan coefficient (Kp) for calculating crop evapotranspiration by using pan evaporation data was taken as 0.7.
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