پژوهشهای حبوبات ایران (Dec 2024)
The yield and Physiological Traits of Two Red Bean Cultivars (Phaseolus vulgaris) under the Influence of Management and Genotypic Factors
Abstract
IntroductionPulses, including red beans, constitute a significant protein source in human nutrition. Beans exhibit symbiosis with nitrogen-fixing bacteria. In recent years, the growing concern for the nutritional quality of products derived from diverse agricultural systems, particularly in relation to chemical fertilizers and their impact on human health and the environment, has prompted the adoption of sustainable agriculture practices. Beans, being water-intensive plants, are susceptible to dehydration. Consequently, this research, driven by persistent drought occurrences, diminishing groundwater levels, the deleterious effects of chemical fertilizers on agricultural lands, and escalating fertilizer costs, as well as the availability of various cultivars of red beans, has advocated for the implementation of drip irrigation, biological fertilizers, and the cultivation of new bean varieties with enhanced seed yields. Materials and MethodsThis experiment was conducted in the years 2018-2019 and 2019-2020 under farm conditions in Aligudarz city, using a 3-replicate split-plot factorial RCBD. The primary factors examined were irrigation methods (furrow and drip), while cultivars (Akhtar and Yaghout) and fertilizers (NPK applied according to the bean fertilizer table, application of biochemical fertilizer, and pure nitrogen application at 30 kg during the three-leaf and five-leaf stages) served as secondary factors. The dimensions of each plot were 6 meters in length and 2.5 meters in width and included 5 rows of planting. weed and pest and disease control were carried out. The traits of the efficiency of remobilization of dry matter to the seed, the share of seed yield from remobilization of plant dry matter and the share of seed yield from plant current photosynthesis, the capacity to accumulate photosynthetic materials and seed yield evaluated and measured. Analysis of variance (ANOVA) was performed using the GLM procedure in SAS. The least significant difference test (LSD) was used to assess the significance of differences in treatment means at the 5 percent probability level. Results and DiscussionThe highest efficiency of remobilization dry matter to seeds in this experiment was of Yaghout cultivar using NPK fertilizer in 2019, which due to the longer vegetative growth and more leaves, led to more photosynthesis and the conditions for producing more reproductive organs. As a result, The highest efficiency of remobilization of dry matter (22%) during the growth period, compared to Akhtar variety (9%) had the highest efficiency of remobilization of dry matter to the seeds. In this experiment the highest and lowest efficiency of remobilization of dry matter to seed was with the use of furrow irrigation in 2019 and the use of drip irrigation in 2020. Also, in each of the irrigation methods, the efficiency of remobilization of dry matter to the seed in 2019 was significantly higher than in 2020. The difference in years from the point of view of this attribute should be considered due to the difference in atmospheric parameters in these two years. Remobilization of dry matter to seed and current photosynthesis of the plant are two important components of the final yield of the plant, and investigating their role as components of seed yield is one of the goals of this experiment. The highest share of seed yield was obtained from remobilization of plant dry matter from the Yaghout cultivar and with the application of NPK fertilizer in 2019 (39.69%) and in 2020 (34.3%). However, the highest share of seed yield from current photosynthesis was assigned to the Yaghout cultivar with the use of NPK fertilizer in both years of the experiment. The share of seed yield from current photosynthesis of the plant is the result of the remobilization of dry matter to the seed as well as the current photosynthesis of the plant. The highest capacity to accumulate photosynthetic materials was obtained in Yaghout cultivar under drip irrigation. while the lowest amount was observed in the Akhtar cultivar with furrow irrigation. Akhtar and Yaghout cultivars in drip irrigation showed capacity to accumulate photosynthetic materials more than furrow irrigation. Therefore, it can be concluded that the physiological parameter of capacity to accumulate photosynthetic materials had the most significant correlation with seed yield in this experiment. The highest seed yield was obtained from the Yaghout cultivar with the application of bio-chemical fertilizers, and the lowest seed yield was of Akhtar cultivar with the application NPK fertilizer. Moreover, the correlation between the variables suggests that the high capacity for assimilating substances in the storage of seeds is the most critical factor influencing the increase in seed yield per unit area. ConclusionsCorrelation coefficients between traits showed that seed yield had the most positive and significant correlation with the share of seed yield from current photosynthesis of the plant and the accumulation capacity of photosynthetic materials. In other words, the two-year results of this experiment showed that the seed yield is mainly the final result of the current photosynthesis of the plant and the capacity for material accumulation in the seeds. Considering the persistent challenges of drought, significant depletion of groundwater, and the escalating costs of chemical fertilizers in recent years, coupled with their adverse impacts on agricultural soils, alongside the genotypic diversity of red beans, there exists a potential to markedly enhance seed yield. This can be achieved by reducing reliance on chemical fertilizers and adopting a combination of biochemical fertilizers and the drip irrigation method in conjunction with the use of genetically modified cultivars of red beans. Strengthening these physiological components emerges as a key pathway to realizing this improvement.
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