جستجوی مقالات مرتبط با کلیدواژه « Phenology stages » در نشریات گروه « کشاورزی »

In the present study, forage quality of three range species including Astragalus gossypinus, Trifolium repens and Poa bulbosa at three phenological stages, (vegetative growth, flowering, seed maturity time) in Borujerd county of Loretan province were evaluated. Data were collected by random sampling using 10 individual plants on transect line in 5 replication. Qualitative indexes were measured and data were compared using ANOVA and Duncan test. Results indicated that DMD is not significant between different species, but it was significant differences (p< 0.01) among the various phenological stages. The highest and the lowest were 34.61 and 24.24% respectively for seeding and before flowering stages. The amount of crude protein was significant at (p< 0.05) in different species, phenological stages and their interactive effect. The highest and the lowest crude protein were obtained in 21.06 and 17.97% in Trifolium repens and Poa bulbosa respectively. The amount of crude fiber was not significant difference between species, on the other hand, in different phenological stages and their interaction was significant at (p< 0.05).The highest and the lowest of crude fiber were 94.30 and 20.86% in seeding time and before flowering phenological stages. The highest and the lowest of amount of ADF were obtained in Poa bulbosa and Trifolium repens with 57.6 and 31.26% respectively. According to obtained results, Trifolium repens, Poa bulbosa and Astragalus gossypinus had better forage quality respectively in before flowering stage where this issue indicates the best time for animal grazing is in May and June.

Allelochemicals of bed species in critical regions of rangelands as Peganum harmala L. may probably have negative effects on germination and growth indexes of improving rangeland species. Considering different responses of some plants to this materials, this research was conducted in order to determine allelopathic potentiality of Peganum harmala L. on an improving rangeland species (Secale montanum). The effects of different proportion of powders mixed with fine sand in pot unit (in 5 levels as 0, 5, 10, 15 and 20%) of two parts (aerial and underground) and three phenological stages (vegetative, flowering and seeding) of Peganum harmala L. were investigated on speed germination, percentage germination, root length and stem length of Secale montanum in factorial design with 3 replication. Another experiment (with ecosystemic consider) was done for determinig the effects of natural habitate soil in rondom design with 3 replication. The results showed that allelopathic effects of vegatative and flowering stage allelochemicals on speed germination, percentage germination and stem length of Secale montanum were more than seeding stage and there was not any Significant difference between these two stage with regard to root length. The allelopathic effect of aerial parts was more than underground parts and the differences in allelopathic property of these parts were severe with increasing propertion powder. Because of negative response speed germination, in spite of other variables to habitate soil effects, we recommended autumn tilling of Secale montanum, in order to compensate delayed germination in regions with cool winter and unsuitable spring conditions.