Effect of different nitrogen sources on plant characteristics and yield of common bean (Phaseolus vulgaris L.)

Relationship between photosynthetic capacity, nitrogen assimilation and nodule metabolism in alfalfa (Medicago sativa) grown with sewage sludge

“…Although some authors have observed that sludge application can diminish plant nodulation ability [19], it was also observed that sludge addition caused no negative effects on the formation of nodules [18,56] contrary to the common view that nodulation is suppressed in soil high in N. Currie et al [57] hypothesize that sludge N do not repress N 2 fixation for two reasons: firstly, sludge N may not be evenly distributed within the rooting zone of plants, and secondly, sludge N is made available to the plant over the entire growing period, not just the early period when nodules are being formed. Also, it has been shown that a small dose of N can stimulate seedling growth and early nodulation such that N 2 fixation and yield are enhanced [58].…”

“…It is well understood that positive response of crops to sludge application is not a general phenomenon, and could depend, at least in part, on the soil type, the sludge applied and/or the technology used for processing raw material [20]. Although other authors reported that application of organic waste products improved growth and yield of legumes compared to those amended with inorganic fertilizer [19], our data showed that nitrate-fed (N) plants exhibited higher growth and leaf area than N 2 -fixing plants (R and RS) ( Table 3). These results are in agreement with the idea that N from organic fertilizers often shows little effect on crop growth in the year of application, because of the slow-release characteristics of organically bound N [55].…”

“…In addition, it was shown that sludge application can improve growth and yield of nodulated legumes [18][19][20][21] but also, this treatment can induce a certain degree of oxidative stress in nodules due to accumulation of heavy metals in rizhosphere [20,22]. On the other hand, it was well established that combined N (especially nitrate) inhibits both nodulation and activity of nodules, which legumes will utilize as N source in preference to forming the N 2 -fixing symbiosis [23].…”

Application of Compost and Vermicompost as Substitutes for Mineral Fertilizers to Produce Green Beans

“…Application of compost to newly reclaimed lands has a positive effect on green bean growth and production (Abdel-Mawgoud, 2006). Vermicompost has a significant positive influence on plant growth, flowering, fruiting, root development, yield and quality of beans (Fernandez-Luqueno et al,2010 andSingh et al, 2011). This study aims to evaluate replacing the mineral fertilizers for producing green beans partly or totally using compost and vermicompost.…”

Applying computational intelligence methods to modeling and predicting common bean germination rates

“…However, even if a relationship between germination rate and temperature were simple, obtaining precise and accurate models that could describe a large proportion of the total variance could never be regarded as a simple modeling procedure. Moreover, the common bean is a profitable agricultural product [27,8,2], and modeling the germination rate of this crop species requires precision and accuracy because of its commercial value. Standard statistical methods could model this relationship (e.g., [12,1]), but they may be limited by both the assumption of linearity and other statistical assumptions.…”