INTEGRATED EFFECT OF VARIETIES, PLANT DENSITY AND WEED CONTROL TREATMENTS ON CHEMICAL COMPOSITION AND YIELD OF SOYBEAN GROWN IN NEWLY RECLAIMED SOIL | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 17, Volume 22, Issue 2, July 2008, Page 258-274 PDF (388.32 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2008.197504 | ||||
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| Authors | ||||
| Ekram, A. Megawer1; Mohamed A. Seif El-Ysazl2 | ||||
| 1Dep. of Agric. Agron., Fac. Agric., Fayoum Univ. Egypt. | ||||
| 2Dep. of Agric. Botany, Fac. of Agric. Fayoum, Univ., Egypt | ||||
| Abstract | ||||
| The effects of Butralin herbicide (2.5 L/fed), H2 and manual hoeing twice, H3 (at 30 and 60 days age) together with three hill spacing (10 (D1), 15 (D2) and 20 (D3) cm between hills) on vegetative growth, chemical composition, yield and yield components and quality traits of two soybean cvs (Giza 111, V1 and Giza 21, V2) and associated weeds, were of interest of the present work. The study was carried out, through split split-plot design at experimental farm of the Fac. of Agric., Fayoum univ., during 2006 and 2007 seasons. The results showed that both Butralin herbicide (H2) and manual hoeing (H3) weed treatments surpassed the unweeded one (H1) in controlling weeds in soybean field. Suppression ratios of weed growth due to manual hoeing (71.3 to76.3%) for broad (BFW), narrow (NFW) leaved and total weeds were higher than that of Butralin (60.19%) for only narrow leaved weeds. Hill spacing significantly affected BFW and total weed weight in the first sample in favor to the closest spacing (D1) which resulted in 30.3 and 36.2% weed excision, respectively, over the widen spacing (D3). The results indicated that hill spacing had lower effect than weed control treatment on weed growth. There was no significant effect of soybean varieties on weed growth. H2 D2 V2 and/or H3 D1V2 exhibited the lowest NFW. In respect to chemical constituents of soybean plants, H2 and H3 markedly exceeded H1 treatment, in favour to H2 for most estimates, with similar values for phenols, carotenoids and anthocyanin with those of H3. Hill spacing showed overlapping effect on chemical constituents, in favour to the intermediate plant density D2 (15 cm) and /or D1 (10 cm). H2 D3, H2 D2, H3V2 as dual interaction as well as H2 D3 V2, H3 D1 V1 and H2 D2 V1 as trio-interactions were of great positive effects on chemical constituents of soybean plants. Regarding yield and its components, H3 treatment produced highest values for yield and its components, while H2 increased vegetatively, i.e. plant height. Narrow spacing (D1) increased numbers of branches and pods and weight of pods, plant seeds and seed yield/fed. Intermediate plant density gave branches and seed yield/fed similar to those of D1. V2 outweighed V1 in yield and its components where is the reverse was true for plant height. Positively effective interactions were H3 D1, H2 V2 and H3D1V2, on weights of pods, number of seeds/plant and seed index. The highest percentages of carbohydrates (23.37), protein(48.10) and oil(22.38%) were recorded by H3D3V2, H2D1V1 and H2D3V1, respectively. The absolutely highest seed yield/fed (1.89) in such newly reclaimed land was obtained by Giza 21 (V2) planted in closest hill spacing D1(10cm ,2 plants/hill) and treated by manual hoeing twice. | ||||
| Keywords | ||||
| Varieties; Plant density; Weed control; Chemical composition; Yield | ||||
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