英语翻译La data obtained in 1997 and 1998 only for some depths w

英语翻译
La data obtained in 1997 and 1998 only for some depths were significantly different respect to the position of the drip irrigation tube,cultivar or interaction between depth of the irrigation tube and cultivar (Tables 5–8).This outcome was probably associated to the high variability of La values,as confirmed by the variation coefficients of the ANOVA,which ranged between 10 and 80%.Great spatial root variability is associated with interaction between root system structure and soil conditions and has been documented by many authors (Brown and Scott,1984; Hamblin,1985; Oliveira et al.,2000; Upchurch,1987; Van Noordwijk,1993; Zobel,1991).Variability may also be associated to the method used.Vos and Groenwold (1987) reported a coefficient of variation of 1.5–1.7 times greater for minirhizotrons than for core sampling.However,the minirhizotron method allows a greater number of replications and is less labour-intensive than core sampling.Bar-Yosef et al.(1991),using soil coring,obtained similar results when comparing subsurface versus surface drip irrigation and they also could not find an unequivocal relationship between treatments and root distribution.Despite the lack of significant differences between treatments based on minirhizotron analysis,the distribution of the root system,in relation to the placement of the drip irrigation tube (Figure 1),observed on soil profiles opened perpendicularly to the plant row,show different rooting patterns among irrigation treatments.A large concentration of roots at the depth of the irrigation tubes was found,which is in agreement with the observations reported for tomato under subsurface drip irrigation by Bar-Yosef et al.(1991),for maize by Mitchell (1981) and Phene et al.(1991) and for cotton by Plaut et al.(1996).

1997年和仅1998得到的La数据一些深度的是对水滴灌溉管的位置的较大不同尊敬,灌溉管的深度和培育品种(表之间的培育品种或者互作用5–8).这个结果大概联系了对La价值的高可变性,如证实由ANOVA的变异系数,排列在10和80%之间.伟大的空间根可变性同根系统结构和土壤情况之间的互作用联系在一起和由许多作者提供了(布朗和斯科特1984年; hamblin 1985年; Oliveira等,2000年; upchurch 1987年; 范・ Noordwijk 1993年; zobel 1991).可变性也许也联系到使用的方法.vos和Groenwold (1987)报告了变化参数更加伟大1.5–1.7的时期的minirhizotrons比对于核心采样.然而,minirhizotron方法比核心采样允许复制的一个更加了不起的数字并且较不劳动密集型.酒吧Yosef等(1991),使用挖出果核的土壤,得到了近似结果,当比较表面下对表面水滴灌溉时,并且他们也找不到治疗和根发行之间的一个毫不含糊的关系.尽管缺乏根据minirhizotron分析的治疗之间的重大区别,根系统的发行,关于水滴灌溉管的安置(在土壤剖面的图1),被观察垂直地打开了对植物行,显示在灌溉治疗之中的不同的根源的样式.根的大集中在灌溉管的深度的等被找到,是与为蕃茄等报告的观察意见的一致在表层下水滴灌溉之下由酒吧Yosef (1991),为玉米由Mitchell (1981)和Phene (1991)和为棉花由等Plaut (1996).