Prediction of growth stages of soybean cultivars and lines using climatologic parameters of photoperiod and temperature in karaj region

Subject Areas : New Finding in Agriculture

Sharareh Nasre Esfahani ¹ (دانشجوی کارشناسی ارشد هواشناسی کشاورزی دانشگاه آزاد اسلامی واحد علوم وتحقیقات تهران)
Jahanfar Daneshian ² (دانشیار مؤسسه تحقیقات اصلاح و تهیه نهال و بذر)
Ebrahim Pazira ³ (دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، گروه زراعت و اصلاح نباتات، تهران، ایران)
Amir hosein Shirani Rad ⁴ (دانشیار مؤسسه تحقیقات اصلاح و تهیه نهال و بذر)

Received: 2015-12-01 Accepted : 2015-12-01 Published : 2011-02-20

Keywords: Cultivars, soybean, Planting date, lines, prediction of growth stage,

Abstract :

Soybean development Reproductive stage werepredicted by climatic parameters as daylength and temperature . Therefore ,fifteen soybean lines and cultivars as name as Williams, Zane, M4, M12, S.R.F, Miandoab,A3935, A3237, L17, Union, Grangelb, Clark, Tns95,Elf, Calland were studied in four planting dates. Soybean genotipes were usedin a RCBD in each planting dates . Daylength and temperature effect wereevaluated by planting dates levels. Flowering occurance and developmentReproductive stage duration were fitted growth degree days, photoperiod andphotothermal units in a Multiple Regression Method. The results indicated thatphotoperiod had significant effect on Maturity in all of lines and cultivars.But photothermal had positive significant effect in Williams. Therefore Itcaused to delay in Maturity if It was increased. Photothermal was calculatedfrom growth degree days by photoperiod in each days. But the photoperiod wasmore effective than gdd in time of Maturity. Growth degree days affected ontime of Maturity by photothermal and caused to promote it. Reproductivedevelopment duration of Elf was affected by gdd

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