Root morphological‐physiological traits for <i>japonica/indica</i> hybrid rice with better yield performance under low N conditions

Newly bred japonica/indica hybrid rice (JIHR) cultivars might produce more grain yield and have better nitrogen-use efficiency (NUE) under low N conditions. This study determined whether an improved root system in JIHR could benefit shoot growth, physiological processes, thereby NUE. Four cultivars, including two local high-yielding japonica (JHR) were field-grown application levels: 120 kg ha−1 (low of N, LN) 180 (normal NN). Grain the amount taken up from soil higher than JHR by 12.1% 18.1% NN 12.5% 14.0% LN, respectively. Compared with had partial factor productivity (PFPN) both treatments internal N-use (IEN) harvest index only LN treatment. Under treatment, several morphological traits, for instance, greater dry weight (DW), length density volume, longer length, larger specific deeper distribution, total active absorption area, oxidation activity (ROA), concentration zeatin (Z) plus riboside (ZR) root-bleeding sap, cultivars. Generally, results suggest that traits NUE