|
|
|
IS PHOTOTHERMAL QUOTIENT DETERMINANT FACTOR FOR SPRING WHEAT YIELD?
M. AHMED*1, FAYYAZ-UL-HASSAN1, ABDUL RAZZAQ1,
M.N. AKRAM1,
M. ASLAM2, S. AHMAD3 AND M. ZIA-UL-HAQ4
Abstract:
Photothermal Quotient as combined effect of temperature and solar
radiation were studied as determinant factor for spring wheat grain
yield. The data obtained at anthesis and maturity for grain m-2,
grain weight and grain yield were examined in experiments involving
three wheat genotypes under five different environmental conditions (E)
provided in the form of planting windows (PW’s) during 2008-09 & 2009-10
at National Agricultural Research Center (NARC), Islamabad. The mean
temperature at anthesis (T1) and maturity (T2) was calculated by
averaging all temperature from germination till anthesis and maturity,
respectively. Similarly, solar radiation at anthesis (SR1) and maturity
(SR2) was calculated- with the Angstrom formula while Photothermal
quotient (PTQ) was calculated at anthesis (PTQ1) and maturity (PTQ2).
The data obtained was subjected to STATISTICA 8 software and scatter
plot regression model was developed- at 95% confidence interval with
crop data and climate variables (T1, T2, SR1, SR2, PTQ1 and PTQ2). The b
(regression coefficient) recorded were 623.73 (GM vs T1), 0.0037 (GW vs
T1), -5.97 (Y vs T1), -0.028 (GW vs T2), -1356.28 (GM vs T2), -57.86 (Y
vs T2), 29.53 (GM vs SR1), 0.0005 (GW vs SR1), 3.95 (Y vs SR1), 19.90
(GM vs SR2), 0.0003 (GW vs SR2), 2.57 (Y vs SR2) 314.20 (GM vs PTQ1),
0.0049 (GW vs PTQ1), 49.88 (Y vs PTQ1), 0.0037 (GW vs PTQ2), 31.87 ( Y
vs PTQ2), 237.40 (GM vs PTQ2) while, b for E and PW with yield was
-872.51 and -309.75, respectively. Direct relationship between PTQ and
yield parameters confirmed that it determined crop yield and its
management for variable environmental conditions need to be opted by
adopting suitable sowing time.
1Department of Agronomy, PMAS Arid Agriculture University
Rawalpindi-46300, Pakistan;
2Ministry of Food and Agriculture Islamabad, Pakistan;
3Department of Agronomy, Bahauddin Zakariya University, Multan-60800,
Pakistan
4Department of Pharmacognosy, University of Karachi, Karachi-75270,
Pakistan
|
|
|