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- W3217509833 abstract "Exogenous plant growth retardants (PGRs) increase yield by reducing lodging occurrence but lower yield if lodging is absent in maize (Zea mays L.). It is hypothesized that PGRs can increase maize yield as well as improve lodging resistance by optimizing application timing. A two-year field experiment was conducted in 2018–2019 using plant growth regulator “Jindele” with active ingredients of ethephon and cycocel (EC; w/w=3:1), lodging susceptible (LS) and resistant (LR) maize hybrids, two plant densities of 60 000 and 90 000 plants ha−1, and four EC application treatments. EC was sprayed at the 8-leaf stage T(8), 15-leaf stage T(15), and both stages T(8 +15), respectively, and no EC application was regarded as control CK. On average, T(8) and T(8 +15) significantly reduced lodging percent compared with T(15) and control due to the optimized morphology and strength of stem and root. Both T(15) and T(8 +15) resulted in a higher kernel number per ear (KN ear−1) than T(8) and CK. In non-lodging conditions, T(15) yielded significantly better than CK, especially for LS hybrid in high plant density of 90 000 plants ha−1 (13,417.4 vs 11,219.2 kg ha−1), mainly as a result of increased kernel number. The increases in yield and kernel number were higher in LS hybrid than in LR hybrid. Both KN ear−1 and KN m−2 were significantly negatively correlated with internode length. The reduced internode length facilitated assimilate partitioning from leaves to the ear in T(8 +15) and T(15), thus increasing kernel number and weight. Ear-plant height ratio was considered an important parameter to evaluate lodging resistance and yield. The optimal ear-plant height ratios were estimated to be 36.6% for KN ear−1, 39.4% for KN m−2, and 38.4% for yield. The optimal range of ear-plant height ratio (36.60%39.43%) should be taken into account when breeding or selecting lodging-resistant and high-yielding hybrids as well as developing crop management to cope with lodging in practice." @default.
- W3217509833 created "2021-12-06" @default.
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- W3217509833 date "2022-02-01" @default.
- W3217509833 modified "2023-09-30" @default.
- W3217509833 title "Optimizing ear-plant height ratio to improve kernel number and lodging resistance in maize (Zea mays L.)" @default.
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- W3217509833 doi "https://doi.org/10.1016/j.fcr.2021.108376" @default.
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