Effects of climatologic parameters, day length and temperature, on phonologic occurrence of soybean lines and cultivars

Subject Areas : New Finding in Agriculture

SH. Nasr-e-Esfahani ¹ , J. Daneshian ² , E. Pazira ³

1 - M. Sc. Student in Climatology, Islamic Azad University, Science and Research Campus, Tehran, Iran
2 - Research Institute of Seed Production and Improvement, Karaj, Iran
3 - Islamic Azad University, Science and Research Campus, Tehran, Iran

Received: 2015-12-08 Accepted : 2015-12-08 Published : 2007-08-23

Keywords: temperature, soybean, Planting date, day length, phenologic occurrence,

Abstract :

Climatic parameters effects as day length and air temperature were studied on phenologic characteristics of soybean. Four separated experiments were done at May 21st till Jul. 5th of 2008 by 15 days increment as four planting dates were used for evaluating of 15 soybean cultivars and lines. Selected varieties were Williams, Zane, M4, M12, S.R.F., A3935, A3237, L17, Union, Grangelb, Clark, Tns95, Elf, Miandoab and Calland. The experiments laid out in RCBD with 3 replications. Williams variety was set as control and the effect of day length and temperature were considered by planting dates treatment. The characteristics such as day to flowering, day to pod and seed formation, day to end of flowering and maturity, reproductivity and maturity development stage growth period were selected as main phonologic aspects. The results indicated that all phenologic characteristics were affected by planting date, cultivars factors and their interaction. Delaying in planting date caused to facilated in flowering, pod and seed formation, end flowering, full maturity times, flowering and reproductive development stages. Photoperiod was effective on all cultivars and lines. Increasing of photoperiod made delaying on maturity time in all cultivars and lines.

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