Ikufīziyuluzhī-i Giyāhān-i Zirā̒ī (Apr 2024)
The Effect of Different Amounts of Nitrogen and Phosphorus on Yield and Some Physiological Traits of Guar Pakistani Ecotype (Cyamopsis tetragonoloba L.) in Different Planting Densities
Abstract
In order to investigate the effect of nitrogen and phosphorus levels on yield and some physiological traits of Pakistani Guar ecotype at different planting densities, a factorial experiment in a randomized complete block design with three replications at the Agricultural Research and Training Center and Natural Resources Jiroft was implemented in two cropping years of 2018-2019 and 2019-2020. Experimental design was factorial based on a randomized complete block design with three replications. Experimental treatments included nitrogen fertilizer at three levels (20, 60 and 100 kg of pure nitrogen in the soil from urea fertilizer source), phosphorus fertilizer at two levels (zero and 75 kg P2O5 from monopotassium phosphate fertilizer source) and plant planting densities of 24, 31 and 24. In square meters, distances between planting rows (30, 45 and 60 cm) were considered. The results showed that nitrogen, phosphorus and planting density had a significant effect on all traits. The highest seed yield and yield components in the first and second year were obtained from nitrogen and phosphorus application at 60 and 75 kg.ha-1, respectively, along with planting density of 31 plants per square meter at 4300 and 4200 kg.ha-1 and more. The highest levels of carotenoids and chlorophyll a and b were related to the application of 100 and 75 kg.ha-1 of nitrogen and phosphorus, respectively, with plant density of 24 m2. Based on the results of this study, it seems that this plant does not need high levels of nitrogen and phosphorus in terms of legume, but is affected by nitrogen and phosphorus for high yield and product quality. Regarding planting density, if the goal is to achieve high yield, planting density of 31 plants per square meter and for high quality planting density of 24 plants per square meter is suitable. Guar can be considered as a plant with low expectations in terms of nutritional needs in the planting pattern program in the climatic conditions of southern Kerman and similar areas.
