A STUDY OF THE EFFECT OF SITE ROTATION OF IRRIGATION LEVELS AND THE DISTANCE BETWEEN DRIPPERS ON SOME PHYSICAL SOIL PROPERTIES AND THE GROWTH OF MAIZE
Abstract
A field experiment was conducted at the site of Karma Ali / located between latitude 30-500N and longitude 47-740E in sedimentary soil of fine clay mixed, calcareous, hyberthermic typic torrifluvent (Al-Atab, 2008) during the spring agricultural season 2021-2022. With the aim of the effect of on-site rotation of irrigation levels using double field drip lines, the distance between the drippers and the degree of soil smoothing on some physical properties of the soil and the growth of maize (Zea mays L.).
It included the site rotation factor for the irrigation level with four rotations: 0-100%, 33-100-100%, 100-66%, and 100-100% calculated on the basis of the American evapotranspiration basin class A. The second factor is the factor of the distance between the drippers 25, 30 and 35 cm distributed alternately on two parallel field pipes for each experimental unit of 12 meters. as a fixed length of the field tube in the experimental unit, and the experiment coefficients were distributed with three replicates, Sectoral design was used complete randomness ( R.C.B.D ), The experimental units were cultivated with a crop of yellow corn in a valley on both sides of the drippers, as drip irrigation is carried out according to the alternations, in addition to the washing requirements of 20%. Soil samples were taken at two depths of 0-20 and 20-40 cm and at three horizontal distances of 0, 15 and 30 cm from the drip source at the beginning and end of the season for the purpose of studying some of the chemical and physical properties of the soil. Plant characteristics were also measured, including plant height and wet and dry weight. The results obtained were summarized by my agencies:
1- The site rotation treatments 0-100%, 33-100%, and 66-100% contributed to the rationalization of irrigation water by 50%, 34%, and 17%, compared to the 100-100% rotation treatment.
2- The results showed that the saturated water conductivity values increased and the bulk density decreased significantly when the site rotation treatment of the irrigation level was 100-100% compared to the site rotation treatments of 0-100%, 100-33% and 100-66%.
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