Vol. 9 (3) : May-June 2018 issue
Green Farming Vol. 9 (3) : 486-489 ; May-June, 2018
Effect of different sowing dates on heat unit requirement for different phenophases of maize hybrids
M. SWETHA SREE1*, V. RAJA RAJESWARI2, P. LATHA3 and T. PRATHIMA4
Department of Crop Physiology, S.V. Agricultural College, Tirupati - 517 502, Chittoor (Andhra Pradesh)
Designation : 1P.G. Student *(m.swethasree92@gmail.com), 2Associate Dean, 3Scientist, 4Senior Scientist
Subject : Plant Physiology, Crop Physiology and Bio-Chemistry
Paper No. : P-7272
Total Pages : 4
Received : 21 May 2018
Revised accepted : 24 May 2018
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Citation :
M. SWETHA SREE, V. RAJA RAJESWARI, P. LATHA and T. PRATHIMA. 2018. Effect of different sowing dates on heat unit requirement for different phenophases of maize hybrids. Green Farming Vol. 9 (3) : 486-489 ; May-June, 2018
ABSTRACT
Field experiment was conducted during kharif seasons of 2016 at S.V. Agricultural college, Tirupathi to study the effect of different sowing dates on heat unit requirement for different phenophases of maize (Zea mays L.) hybrids. The experiment was conducted with three maize hybrids (DS 900M, Pinnacle and CP818) with four dates of sowing (June II FN, July I FN, July II FN and August I FN) with recommended dose of fertilizer (200 kg ha-1). Results revealed that the Pinnacle recorded highest AGDD, APTU and AHTU were 3053.3°C, 36151.1°C day hour and 17098°C day hour respectively from emergence to physiological maturity. Pinnacle recorded highest number of days taken to physiological maturity (106) followed by D.S 900M (104) and CP818 (102) crop took from emergence to physiological maturity. Progressive delay in sowing caused a decrease in AGDD i.e., 3170.4 to 2920.8°C and hybrids 2994.1 to 3053.3°C from sowing to physiological maturity. Mean HUE across all the hybrids and sowing dates was 1.0 and 1.0 respectively.
Key words :
GDD, HTU, Hybrid maize, HUE, Phenology, Physiological maturity, PTU.
