PARAMETERS OF YIELD – EVAPOTRANSPIRATION RELATIONSHIP FOR SOYBEAN | ПАРАМЕТРИ НА ВРЪЗКАТА ДОБИВ – ЕВАПОТРАНСПИРАЦИЯ ЗА СОЯ
2012
Matev, A., Agricultural University, Plovdiv (Bulgaria) | Petrova, R., Agricultural University, Plovdiv (Bulgaria) | Zhivkov, Zh., University of Forestry, Sofia (Bulgaria)
The aim of this study is to establish parameters of Yield-evapotranspiration relationship for soybean, grown in Plovdiv region by regulated water deficit by reduction of irrigation rates conditions. The experiment was carried out during 2004 – 2006 period on the experimental field of Agricultural University – Plovdiv. Soil on the experimental field is Mollic fluvisols FAO–UNESCO. The following variants were tested: 1 without irrigation; 2 irrigation rate 25% 25%m 3 50%m; 4 75%m; 5 optimum irrigation by 75% FC for the layer 0 – 80 cm 100%m. The relative values of yield and ET are used for establishment of relationship parameters. Data from all variants are calculated by FAO linear equation and multi degree formula by Davidov. Kc values by linear relationship varies from 1.12 to 3.32 in average 1.68 and R = 0.986 from 0.894 to 0.966. The follow relationship parameters are established by multi degree formula: n = 1.34, m = 3.65, R = 0.987. Both formulas give very accurate results, but the multi degree formula by Davidov presents a smooth change in yield with increasing ET .
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