Abstract Calibration of minirhizotron data against root length density (RLD) was carried out in a field trial where three drip irrigation depths: surface (R0) and subsurface, 0.20 m (RI) and 0.40 m depth (RII) and two processing tomato cultivars: `Brigade' (CI) and `H3044' (CII) were imposed. For each treatment three minirhizotron tubes were located at 10, 37.5 and 75 cm of the way from one plant row to the next. Roots intersecting the minirizotrons walls were expressed as root length intensity (L a) and number of roots per unit of minirhizotron wall area (N ra). Root length density (RLD) was calculated from core samples taken for each minirhizotron tube at two locations: near the top of the minirhizotron (BI) and 15 cm apart from it, facing the minirhizotron wall opposite the plant row (BII). Minirhizotron data were regressed against RLD obtained at BI and BII and with their respective means. The results show that for all the situations studied, better correlations were obtained when RLD was regressed with L a than with N ra. Also was evident that the relationship between L a and RLD was strongly influenced by the location of soil coring. RLD was correlated with L a trough linear and cubic equations, having the last ones higher determination coefficients. For instance at 10 cm from the plant row when values from the top layer (0–40 cm) were analysed separately, L a was significantly regressed with RLD measured at BII and described by the equations: RLD = 0.5448 + 0.0071 L a (R 2 = 0.51) and RLD = 0.4823 + 0.0074L a + 8×10–5 L a 2 – 5×10–7 L a 3 (R 2 = 0.61). Under the 40 cm depth the highest coefficients of determination for the linear and cubic equations were respectively 0.47 and 0.88, found when L a was regressed with RLD measured at BI. For minirhizotrons located at 75 cm from the plant row and for location BI it was possible to analyse jointly data from all depths with coefficients of determination of 0.45 and 0.59 for the linear and cubic equations respectively.
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机译:摘要在田间试验中对根际密度(RLD)进行了根际微耕作数据的校准,该试验进行了三种滴灌深度:表层(R0)和地下,0.20 m(RI)和0.40 m深度(RII)以及两种加工番茄品种:实施了“旅”(CI)和“ H3044”(CII)。对于每种处理,从一排植物到下一排植物的距离分别为10、37.5和75厘米,三个微型根管。横切迷你电子发根管的根系表示为根长强度(L a)和每单位迷你电子发根管壁面积的根数(N ra)。根长密度(RLD)是从每个微根管的两个位置取的核心样品计算得出的:靠近根际管(BI)的顶部和与植物行(BII)相对的面向最小根管壁的15厘米。 Minirhizotron数据针对在BI和BII获得的RLD及其各自的均值进行了回归。结果表明,在所研究的所有情况下,使用L a回归RLD均比使用N ra回归更好的相关性。同样明显的是,L a和RLD之间的关系受到土壤取芯位置的强烈影响。 RLD与L a谷线性方程和三次方程相关,最后一个具有较高的确定系数。例如,在距植物行10 cm处,分别分析顶层(0–40 cm)的值时,L a与在BII下测得的RLD显着回归,并由以下公式描述:RLD = 0.5448 + 0.0071 L a(R 2 = 0.51),RLD = 0.4823 + 0.0074L a + 8×10-5 L a 2 – 5×10-7 L a 3(R 2 = 0.61)。在40 cm的深度下,当L a与BI处测得的RLD回归时,线性方程和三次方程的最高确定系数分别为0.47和0.88。对于距离植株行75厘米的微型根管和位置BI,可以联合分析所有深度的数据,线性方程和三次方程的确定系数分别为0.45和0.59。
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机译:叶绿素/壳聚糖/小球藻/铁/钙/ DHA / EPA /含绿豆/黑豆/红豆/白豆室温暴露,绿豆芽/绿色寄主豆芽/大白菜/新鲜/羽衣甘蓝/马铃薯/大蒜/姜/生姜/黄瓜/南瓜/菠菜/人参/红鸭/迷你番茄/西瓜/瓜,嫩芽/马铃薯/甘薯/黄瓜/西瓜/瓜/大白菜/大蒜/生姜/普通大米,阿克巴里,大米/大米/大麦/荞麦/橡子塑料空气分配孔,把手,阳光遮蔽的盖子,水分配孔处理幼苗,处理水耕栽培容器,不良,岩石形成,固体培养基,水耕,稻田,田地,耕种