Quantificação do rendiemnto do amendoim no cultivo em sequeiro em Chókwe (Gaza)

Abstract

The thesis is the result of a research conceived in the hope of answering two main objectives: One, which consisted in making predictions of the yield of the peanut (Arachis hypogara ) crop in the dryland district of Chókwè through the relationship between adjusted evapotranspiration and crop evapotranspiration ( ETcajf (Tc)e The sensitivity factor or water stress (ty). The other objective was to relate the relative yields (f°/fp) of the model and real dryland yields (^r). From the study, the maximum ETc was 886 and minimum 343mm and the maximum ETcaj was 568 and a minimum of 161 mm and about 72% of the studied campaigns had an ETcaj between 50 and 90% of the ETc. The confidence interval of the expected relative yield in dryland (Chókwè) of the peanut crop is between 44 and 62% (significance level 95%). The average relative yield was 52.9% (model), it was also found that the 1st and 2nd phases of the life cycle of the upland crop do not present significant yield losses, with the average yield being 98% and 95% respectively. The 3rd and 4th phases of the culture show significant yield losses on average 30%. These two phases are very sensitive (critical) to water stress, lacking greater irrigation water needs in order to prevent the plant from having severe stress (significant yield losses). The crop evapotranspiration deficit is about 320mm which corresponds to a minimum reservoir with a volume of >3200m3/ha to satisfy the 3rd and 4th phases. The thesis recommends the use of the water balance model in the root zone to carry out forecasts, as the work confirmed the existence of a relationship between the relative yields of the model and the yields recorded in dryland.