معرفی مقیاس بهره‌برداری برای سه گونه علف گندمی در ایستگاه تحقیقاتی سیساب استان خراسان شمالی

There are various methods for measuring the utilization of grasses that each of these methods has its advantages and disadvantages. Using gauge for measuring exploitation and utilization of grass and grass-like species is one of these methods. This study introduces the utilization scale to determine the utilization rate of three species of grasses. Thus, the utilization rates of three species of grasses (Agropyron elongatum (Host) P. Beauv. Agropyron pectinofome (Roemen & Schutes.) and Hordeum bulbosum (L.)) were determined using gauge utilization. In order to use a utilization gauge the existence of utilization scale for studied species is necessary while such scale has not already been prepared in our country therefore at first the scales must be developed. Thus 10 specimens of the studied species were sampled to be used for preparing the utilization scale. Results showed that all regression equations have a high correlation coefficient and were all significant and functions were as natural logarithm or Napery which means the relationship between height and weight is affected by canopy structure of the species. The results of the utilization scale showed that with a specified level of utilization, remained height percentage of Hordeum bulbosum (L.) species is less than Agropyron elongatum ((Host) P. Beauv.) and Agropyron pectiniforme (Roemen & Schutes.) species. This seems to be related to the plant structure of Agropyron elongatum((Host) P. Beauv) and Agropyron pectiniforme (Roemen&Schutes.) species that these species form bunch grass in which weight of plant is mostly concentrated on the upper parts of the plant. Because this method is rapid, nondestructive and very cheap, the use of gauges is recommended to estimate the utilization rate of grasses species native to Iran.
Keywords: Utilization; Grasses; Utilization gauge, Sisab