Effects on Dry Matter Accumulation and Distribution in Maize: Drought and Re-watering at Jointing Stage in Arid Area

doi:10.11924/j.issn.1000-6850.casb2023-0338

Abstract

Abstract:

This study focuses on the impact of drought and re-watering on dry matter accumulation and distribution during the jointing stage of maize in arid areas, in order to provide a scientific reference for the growing and water-saving irrigation of maize in arid areas. In 2016, a field experiment was carried out at dessert ecological and agricultural meteorological station of Wuwei in Gansu Province. Three treatments were set with the same variety, including CK (control treatment with sufficient water supply in the whole growth period), T₁ (water control treatment at jointing stage), and T₂ (water control-re-watering treatment at jointing stage). The differences of dry matter distribution and transfer in maize under different treatments were compared by comparative analysis. The results showed that drought reduced dry matter accumulation rate (compared with CK treatment, the dry matter accumulation rate of T₁ treatment decreased by 22.14%, 32.66% and 40.43% at the jointing stage, tasseling stage and milking stage); finally, the total dry matter accumulation was reduced (compared with CK treatment, the dry matter accumulation of a single plant of T₁ treatment at the jointing stage, tasseling stage and milking stage was decreased by 21.62%, 27.52% and 34.39%); the biomass was increased due to re-watering after drought at jointing stage (dry matter accumulation of T₂ treatment at tasseling stage, milking stage and maturity stage was increased by 18.20%, 24.13% and 20.19% compared with T₁ treatment), but it could not be increased to the level of sufficient irrigation treatment. In addition, drought inhibited transfer of dry matter from other organs to ear, and the distribution ratio of dry matter in ear at the milking stage and maturity stage was CK>T₂>T₁. Although the compensation effect of re-watering after drought reduced the impact of drought on dry matter transfer, drought still had an irreversible impact on dry matter accumulation of maize.

Key words: maize, jointing, drought, re-watering, dry matter

CHENG Qian, DING Wenkui, ZHAO Funian, ZHANG Peng, LI Xingyu. Effects on Dry Matter Accumulation and Distribution in Maize: Drought and Re-watering at Jointing Stage in Arid Area[J]. Chinese Agricultural Science Bulletin, 2023, 39(33): 19-24.

Figures/Tables 4

References 27

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处理	叶片		叶鞘		茎秆		穗
处理	干物质量/g	占总量/%	干物质量/g	占总量/%	干物质量/g	占总量/%	干物质量/g	占总量/%
CK	28.64	10.58	13.42	4.96	41.09	15.18	187.64	69.29
T₁	30.05	13.66	15.67	7.12	46.85	21.29	127.45	57.93
T₂	30.55	11.49	19.35	7.28	41.51	15.62	174.34	65.6

处理	叶片		叶鞘		茎秆		穗
处理	干物质量/g	占总量/%	干物质量/g	占总量/%	干物质量/g	占总量/%	干物质量/g	占总量/%
CK	28.64	10.58	13.42	4.96	41.09	15.18	187.64	69.29
T₁	30.05	13.66	15.67	7.12	46.85	21.29	127.45	57.93
T₂	30.55	11.49	19.35	7.28	41.51	15.62	174.34	65.6