فهرست مطالب afshin ariz

One of the strategies of using low-soluble P farctions in the soil is selection and cultivation of plants and varieties with high P uptake efficiency. According to the necessity of P uptake efficiency and effective mechanisms in commercial varieties of sugarcane knowledge, a pot experiment was carried out in greenhouse condition in Hakim Farabi Agro-Industry CO.. The treatments were P fertilizer (including: blank (P0), 125 (P50) and 250 (P100) kg ha-1 as triple superphosphate) and varieties of sugarcane (including: CP57-614, CP69-1062 and CP48-103) in three sampling times (including: 45, 90 and 130 days after planting) with three replications in factorial based on completely randomized design. In this study, P uptake, root length, specific root length, root to shoot ratio and P influx were evaluated at each sampling time. In low available P condition, the CP48 and the CP57 varieties able to uptake more P and then considered as efficient P varieties. However, CP69 has less ability to uptake of P in this condition. In this condition, CP48 variety, P uptake was increased by 13% and 45% compared to CP57 and CP69 varieties respectively. However, CP57 showed enhancement of P uptake up to 29% compared to CP69 variety. Phosphorus influx decreased in CP57 and CP69 varieties by 53% and 67% respectively with aging of sugarcane that the greatest decrease of influx was observed in CP69 variety. In the CP48 variety, P influx increased up to 66%, which can be an effective factor in more P uptake. Therefore, these differences in the ability of P uptake in sugarcane varieties and mechanisms affecting P uptake can improve the management of P fertilizer consumption especially in ratoon.