MAPPING THE PRESENT AND FUTURISTIC CROP WATER REQUIREMENT USING FAO-CROPWAT FOR WHEAT CROP UNDER SUB-TEMPERATE CLIMATE OF NORTH-WESTERN HIMALAYA
Loading...
Date
2018-07-21
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CSKHPKV, Palampur
Abstract
The present study “Mapping the present and futuristic crop water requirement using FAO-CROPWAT for wheat crop under sub-temperate climate of North-Western Himalaya” was undertaken based on a field experiment conducted during rabi during 2016-17 at research farm of Department of Agronomy, FGM, CSK HPKV at Palampur. The experiment was conducted in randomized block design with five dates of sowing viz., 15th October, 30th October, 15th November, 30th November and 15th December and two varieties viz., HPW-349 and HPW-155 replicated thrice. The soil of the site represents silty clay loam soil, acidic in nature and medium in available nitrogen, phosphorus and organic carbon. The growth attributes viz., plant height, leaf area index (LAI), number of tillers, spike length and yield attributes viz., numbers of grain per spike and 1000-grain weight were significantly highest in timely sown crop 15th to 30th October which were reflected in higher grain yield. The sowing done after 15th November to 15th December resulted in significant reduction in yield. The decrease in yield in 15th November, 30th November and 15th December sown crop over 15th October sown crop was 11.4%, 16.1% and 16.9% respectively. Among varieties HPW-349 gave significantly highest growth and yield attributes as compared to HPW-155. The net returns and B:C ratio were significantly highest in timely sown crop from 15th October and 30th October. Likewise net returns and B:C ratio were significantly highest in HPW-349 as compared to HPW-155. The agro-meteorological indices viz., GDD, HTU, PTU, PTI and HUE showed higher values in timely sown crop compared to late sown crop and decreased with delay in sowing. The crop water requirement of crop from 15th October to 15th December varied between 503.3 mm to 409.1 mm, respectively. Under changed climatic scenario like 10C, 20C and 30C elevated temperature, the crop water requirement increased by approximately 2.5%, 5.3%, and 7.5%, respectively during the growing season. Whereas, the actual irrigation water requirement of crop during 15th October to 15th December varied from 174.7 mm to 185.3 mm respectively. The actual irrigation water requirement increased by approximately 20.5 to 22.0%, 21 to 23.5%, and 22 to 24.5% during growing season with elevated temperature of 10C, 20C and 30C, respectively. The irrigation requirement estimated was nil due to corresponding higher effective rainfall during January. Effective rainfall was 73% (271.2 mm) of the total rainfall (376.5 mm) received during the crop season.
Description
Keywords
null