Test and evaluation single plant threshing unit at experiment with some barely varieties

عسکری اصلی ارده, عزت اله and مروتی دمدل, حامد and لونی, ریحانه Test and evaluation single plant threshing unit at experiment with some barely varieties. In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

In research centers for cereal breeding, in many cases, single plant or cluster is required to threshing for investigation the grain characteristics. Hence, it is necessary the use of a laboratory threshing unit with a low capacity. It's hard to threshing some barley varieties with hand and It takes a lot of time. The purpose of this study was to test and evaluate a laboratory threshing unit of a single plant or one cluster with conventional barley varieties in Ardabil province. In this research, the performance of a laboratory threshing unit (threshing losses and damaged grain percent) in application with three cultivars (CD88, Macoei, Jolgheh), three grain values (30, 40, 50 g), three blade rotational speeds (550, 650 and 750 rpm) and threshing time with two levels (20 and 25 s) were investigated. The inverter was used to change the velocity of the blade. The blade's distance from the bottom of the cylinder was 3 mm. It is applied three factors complete randomized design for analysis of data. The results of analysis of variance of data showed that the effects of independent factors as well as the interactive effects included varieties, grain value, blade rotational speed and threshing times were significant on threshing losses and percentage of damaged grains. The highest and lowest mean losses were allocated to the CD 88 variety and the Jolghe with the values of 6.978 and 3.957 %, respectively. The highest and lowest grain losses were obtained in the cluster value of 50 and 30 g with the values of 8.022 and 3.0528%, respectively. The lowest threshing losses were achieved at a rotational speed of 750 rpm with values of 1.035%. With a change in the threshing time from 20 to 25 s, the mean of threshing losses fell from 6.385 to 4.210%. The means of the main effects of factors and more than 90% of interactions on the percentage of damaged grains was less than 1%.

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