A big root system in a cross can be obtained by selecting parents lineswith large root weight, total root length, total length of lateral roots.
选择具有较大根重、总根长、侧根长等性状的自交系作为亲本，可能得到这些性状具有优势的杂交种。
参考来源 - 玉米氮高效品种选育及根系形态对低氮反应的遗传分析·2,447,543篇论文数据，部分数据来源于NoteExpress
The higher the precipitation, the greater the root depth, total root length and root diameter, the more lateral roots and the lower ratio of root to shoot.
降雨量越大，根系越深、总根长越大、根系直径越大、侧根越多、根冠比越低。
Root length density varied with fertigation frequencies, and the ratio of root length for different soil layers to the total root length in the profile varied with fertigation strategies.
施肥频率对根密度的影响主要是引起各土层根密度大小的变化，运行方式则对各土层根长占整个剖面根长总和的比例产生影响。
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