PJB-2020-141
ROOT TENSILE PROPERTIES OF FIELD-GROWN MAIZE IN RESPONSE TO ITS AGE
Shengqun Liu
Abstract
This paper focuses on the tensile properties of different nodal roots in response to increasing its age of spring maize, and relationship between tensile properties and its N, K, Ca and Mg concentration of nodal roots. A two-year field study was conducted three planting densities (44,000, 66,000, and 88,000 plants per ha, which are abbreviated as D44 K, D66 K and D88 K, respectively). The change of tensile properties of different nodal roots at three stage (silking, dough and physiological maturity stage, which are abbreviated as SS, R4 and R6, respectively) were quantified, and the relationship between tensile properties and N, K, Ca and Mg concentration of nodal roots of different whorls were analyzed. The results showed that the tensile modulus and strength of the nodal roots of the 1st, 2nd, and 3rd whorls (from base nodes to upper) under D88 K, that of the 7th whorl under D66 K and that of the 8th whorl under D44 K were decreased at R6 stage. The tensile modulus and strength positively correlated to N, Ca and Mg concentrations, and negatively correlated to K concentration in nodal roots. Conclusions：The age of nodal roots affected the tensile strength and modulus in maize, and the changes of tensile strength were related to the concentrations of N, K, Ca and Mg.
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