Growth, nodulation, and yield of soybean and associated weeds as affected by weed management

Abstract

o número, peso fresco e seco dos nódulos, raiz, caule e peso seco total da planta, enquanto duas capinas manuais aumentaram significativamente das características citadas. Duas capinas manuais e os herbicidas de pré-emergência aplicados nas doses recomendadas aumentaram o rendimento da soja e seus atributos. Duas capinas manuais produziram maiores números de vagens por planta, peso de vagem por planta e número de sementes por planta em 140,7; 150,0 e 59,8%, respectivamente, comparado ao tratamento capinado. Por outro lado, oxadiargyl aplicado na dose recomendada (480 g ha -1 ) apresentou maior rendimento de semente (g planta -1 ), rendimento de semente (kg ha -1 ) e rendimento biológico (g planta -1 ) que o tratamento sem capina em 87,3; 85,0 e 88,2%, respectivamente. Prometryn na dose de 1,50 kg ha -1 , seguido de duas capinas manuais produziu a maior percentagem de proteína na parte aérea e sementes como também de óleo na semente, comparado a outros tratamentos de controle de plantas daninhas.Palavras-chave: Glycine max; herbicidas, manejo de plantas daninhas.ABSTRACT -Two field experiments were conducted at the experimental farm of the National Research Centre at Shalakan, Kalubia Governorate, Egypt, during 2006 and 2007 seasons, to study the effect of three pre-emergence herbicides, prometryn [at the rate of 0.75, 1.5 and 2.25 kg ha -1 ], oxadiargyl [at the rate of 240, 480 and 720 g ha -1 ] and butralin [at the rate of 1.20, 2.40 and 3.36 kg ha -1 ], two hand hoeing treatments and a nonweeded check, on weed infestation, nodulation, growth, yield and yield attributes of soybean plants. Two hand hoeing treatments resulted in the highest weed depression expressed as the lowest fresh and dry weights of broadleaved, grassy and total weeds. The reduction percentage in weed dry matter compared to the nonweeded treatment was 98.3, 92.64 and 96.9% in broadleaved, grassy and total weeds, 856 respectively. Application of the three herbicides at higher or recommended doses significantly reduced fresh and dry weight of the weeds compared to the nonweeded treatment. The results indicated that all the three herbicides at rates higher than the recommended markedly decreased the number, fresh and dry weight of nodules as well as root, shoot and total dry weight plant -1 , while application of two hand hoeing treatments significantly increased these traits. Two hand hoeing treatments and pre-emergence herbicides at the recommended rates markedly increased soybean yield and its attributes. Two hand hoeing treatments gave the highest values of number of pods per plant -1 , weight of pods per plant -1 and number of seeds per plant -1 by 140.7, 150.0 and 59.8%, respectively, compared to the nonweeded treatment. On the other hand, oxadiargyl at the recommended rate (480 g ha -1 ) was the best treatment for promoting seed yield (g plant -1 ), seed yield (kg ha -1 ) and biological yield (g plant -1 ) compared to the nonweeded treatment by 87.3, 85.0 and 88.2%, respectively. Prometryn at the rate of 1.50 kg ha -1 , followed by two...

Effect of Rhizobial Inoculation and Weed Control on Weed Species, Bactria Nodulation and Peas Yield

“…0%, 66.7 & 61.9%, 43.9 & 38.5% and 41.1 & 33.4%, respectively, in first season and 53.6 & 48.0%, 66.7 & 60.9%, 47.7 & 39.8% and 38.8 & 30.9%, respectively, in second seasons. These results are in agreement with those recorded by Abd El-Hamid & El-Metwally (2008) this might have been due to the internal herbicides effect on the plant growth processes. Also, the herbicides tested in this study are known to adversely affect plant photosynthesis.…”

Co-inoculation with some PGPR strains on Soybean Yield and control of damping-off disease

“…THE ROLE OF SOME PGPR STRAINS TO BIOCONTROL RHIZOCTONIA SOLANI In general, it is important to estimate carbohydrate and protein contents in the yielded seeds of soybean plant for seed qual¬ity assessment, These results coincided with those of other workers who reported that increasing growth, total carbohydrates, protein and oil con¬tents in the yielded seeds with using different biofertilizers (Abdelhamid and El-Metwally 2008;El-Rokiek et al 2010 ). Also, Raj et al (2004);Meenakshi (2008) and Radha et al (2009) who reported an increase of protein content due to different inoculations with B. japonicum, B. megaterium and methylotrophs isolates.…”

Influence of Plant Population and Weed Control Treatments on Associated Weeds, Growth, Yield and Quality of Faba Bean

“…Such superiority of these weeded treatments may be related with minimizing weed-crop competition Table 1 this in turns increased faba bean growth Table 2 and reflected on increasing the yield of faba bean. The positive effect of weeded practices on faba bean yields and its attributes have been confirmed by Abd El-Razik (2006), Abdelhamid and El-Metwally (2008), El-Metwally (2016) and El-Metwally and Dawood (2016). The data graphically in Figs 4 and 5 clearly showed that there was a significant interaction between plant populations of faba bean and weed control treatments on pod dry weight/plant and seed yield/fed.…”

“…Moreover, application of two hand hoeing method is the more effective in suppressing weeds and increasing faba bean seed yield (Abd El-Razik, 2006). Abdelhamid and El-Metwally (2008) reported that oxadiargyl was the superior treatment for improving plant productivity as compared with the unweeded treatment.…”