Irrigation Time management in the beans crop canopy temperature using Tape irrigation method

Torabnezhad, Haleh (2018) Irrigation Time management in the beans crop canopy temperature using Tape irrigation method. Masters thesis, University of Mohaghegh Ardabili.

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Text (مدیریت زمان آبیاری گیاه لوبیا چیتی با استفاده از دمای پوشش سبز گیاه در آبیاری به‌روش تیپ) Haleh Torabnezhad.pdf Download (471kB) | Preview

Abstract

Reducing water resources and overuse of chemical fertilizers are one of the most important problems of agriculture in recent years. In this research, the effect of fertilizer management and irrigation on yield, yield components of bean chitti (native cultivar of Ardabil city) as well as the ability of water stress index of plant in irrigation plantation of Bean Chati (during 1396) was investigated at the experimental farm of Mohaghegh Ardebil University. Drip irrigation method was performed. Irrigation treatments consisted of three irrigation levels of 100, 85 and 70% of pure plant water requirement (I1, I2 and I3 respectively) and urea treatment at three levels of 500, 375 and 250 kg. ha-1 (N1, N2 and N3 respectively), three replications Were applied. Complete water requirement was determined based on soil profile and total fertilizer based on soil fertility test. Based on the results of this study, decreasing water consumption caused a significant decrease (at 1% level) of grain yield, dry matter and 100 seed weight. For example, with decreasing of irrigation water from 100% to 85% and 70%, there was a decrease of 11% and 18% in the weight of 100 seeds of bean. However, in examining dry matter and seed yield values in two treatments of 100 and 85% irrigation, there was no significant difference between the effect of these two treatments on the traits. Therefore, according to the results of this study, under the same conditions, using 85% irrigation treatment, while maintaining significant water levels, can expect the yield to be similar to full irrigation. Also, based on the calculations, the lower baseline for June, July and August respectively (Tc-Ta) I.I =13.07-0.33×VPD, (Tc-Ta) I.I =12.09-0.45×VPD, (Tc-Ta) I.I =13.07-0.33×VPD. The base line for May, July and August is also respectively19.23, 18.35,13.18. The average value of water stress index for the three irrigation treatments I1, I2 and I3 was 0.2, 0.26 ,0.31. The reason for this amount can be this the plant, due to irrigation, has closed its apertures in order to cope with dehydration and as a result, the leaf temperature of the plant has increased and the result is an increase in the water stress index. In this research, because the weather conditions were the same for all three irrigation treatments, the only factor affecting the increase of water stress index of the plant is the increase in leaf temperature of the plant

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