نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زراعت و اصلاح نباتات، دانشکدگان کشاورزی دانشگاه تهران، کرج، ایران
2 گروه زراعت و اصلاح نباتات، دانشکدگان کشاورزی دانشگاه تهران، کرج ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In order to investigate the effectiveness of random, zigzag and diagonal sampling methods with 28, 29 and 28 sampling units respectively, the shape and the size of the square in estimating the weed population of corn fields under drip, Furrow and sprinkler irrigation, a research was conducted in 2020 in six corn fields. In order to estimate the accuracy of the sampling methods, first, the studied area was gridded with the standard grid sampling method of 5 m x 5 m and at the using a square quadrat (100 x 100 cm), The data related to the density and diversity of weeds by species were recorded at the four-leaf stage of corn. The results showed that one square meter quadrats had a better estimate of species diversity and weed population density in corn fields under three irrigation systems. But when only weed density is considered, the use of a rectangular square of 0.25 m2 was able to estimate weed density with acceptable accuracy. the sampling methods showed different estimates of the population density of weeds, so that the diagonal sampling method in the drip irrigation system and the sampling methods Zigzag and random in sprinkler and furrow irrigation systems showed less error compared to grid sampling method. Meanwhile, in the investigation of single weed species, the diagonal systematic sampling method in all three irrigation systems showed the least error in the accuracy of the density estimation of the studied species compared to the grid method.
کلیدواژهها [English]
)