~ 2418 ~ Journal of Pharmacognosy and Phytochemistry 2018; SP1: 2418-2421 E-ISSN: 2278-4136 P-ISSN: 2349-8234 JPP 2018; SP1: 2418-2421 Rajan Chaudhari Department of Agricultural Meteorology, Narendra Deva University of Agriculture & Technology Narendra Nagar, Kumarganj, Faizabad, (U.P), India SR Mishra Department of Agricultural Meteorology, Narendra Deva University of Agriculture & Technology Narendra Nagar, Kumarganj, Faizabad, (U.P), India Pawan Kumar Department of Agricultural Meteorology, Narendra Deva University of Agriculture & Technology Narendra Nagar, Kumarganj, Faizabad, (U.P), India Devraj Singh Department of vegetable Science Narendra Deva University of Agriculture & Technology Narendra Nagar, Kumarganj, Faizabad, (U.P), India Sharvan Kumar Department of vegetable Science Narendra Deva University of Agriculture & Technology Narendra Nagar, Kumarganj, Faizabad, (U.P), India Correspondence Rajan Chaudhari Department of Agricultural Meteorology, Narendra Deva University of Agriculture & Technology Narendra Nagar, Kumarganj, Faizabad, (U.P), India Effect of crop growing environment on yield and yield components of wheat cultivars (Triticum aestivum L.) Rajan Chaudhari, SR Mishra, Pawan Kumar, Devraj Singh and Sharvan Kumar Abstract A field experiment was conducted during the Rabi season of 2015 to access the “Effect of crop growing environment & yield and yield components of wheat cultivars (Triticum aestivum L.)” in silty loam soil at Agro-meteorological Research Farm, N.D. University of Agriculture & Technology, Kumarganj, Faizabad. The experiment was conducted with Randomized block design and replicated four times with nine treatments combinations consisted of three dates of sowing viz. S1 (15 th November), S2 (30 th November) and S3 (15 th December) and three cultivars viz. V1 (PBW-373), V2 (DBW-17) and V3 (PBW- 550). Plant height, number of tillers, leaf area index, dry matter, and yield attributes parameters were recorded at different growth stages. All the biometric parameters decreased with delay in sowing. Among the different varieties of wheat. Keywords: Plant height (cm), Number of tillers /m 2 , LAI, Dry matter accumulation (g/m 2 ), GDD and Yield &yield attributes Introduction Wheat (Triticum aestivum L.) belongs to the poaceae family. It is the important cereal crop, and has been considered as integral component of the food security system of several nations. It hold second rank in the world among the cereals both in respect of acreage 221.76 m ha -1 and production 696.64 mt. (Anonymous 2012-13). In India total area under wheat is 29.40 m ha -1 with the total production of 93.62 mt and productivity 2.95 tonnes ha 1 . Uttar Pradesh ranks first in respect of area and production which is about 9.25 mha -1 with the total production of 25.60 mt and productivity of 27.90 qha -1 , but the average productivity in our state is comparatively much lower than that of Punjab and Haryana. Wheat is a major staple food crop after rice is south East Asia. The wheat acreage in South Asia is more than 36 million ha which is around 16% of the global wheat area and production is around 95 million tonnes which is around 15% of world wheat (Anonymous 2012–13). In India wheat also occupies second place after rice. Wheat is winter crop of northern, central and occur peninsular region of country. About 91% of total wheat production is contributed by six states in the country (Uttar Pradesh, Punjab, Haryana, Madhya Pradesh, Rajasthan and Bihar). Seasonal temperature is an important climatic factor which has profound effects on the yield of Rabi crops. Changes in seasonal temperature affect the grain yield, mainly through phonological development processes. Winter crops are especially vulnerable to high temperature during reproductive stages and differential response of temperature change (rise) to various crops has been noticed under different production environments (Kaur and Hundal, 2007). The effect of temperature on the wheat productivity can easily by seen in Central India because of high inter-annual fluctuations in the productivity due to fluctuations in seasonal temperature. The productivity of wheat is largely dependent on the magnitude of temperature change. One 0 C increase in temperature throughout the growing season will have no effect or slight increase on productivity in north India. But, an increase of 2 0 C temperature reduced potential grain yield at most of the places (Agrawal and Sinha, 1993). In India, wheat is grown in almost all the states coming in North and Central region. It is generally sown during October to December and harvested from February to May month. Wheat is a Rabi crop. It is sown in mid-October to mid-November and harvested in March. It grows well in cool, moist climate and ripens in a warm, dry climate. The cool winters and the hot summers are conducive to a good crop. A cloudless sky having bright sunshine during ripening and harvesting periods will make better quality wheat. Winter rainfall is ideal. It is a long day plant. Temperature ranging between 20 to 25 o C is ideal for seed sowing and germination. Where as the optimum temperature for vegetative growth ranges from 16 to 22 o C. During the grain development wheat requires a mean maximum temperature of about 25 o C for at least 4-5 weeks