Effect of Enhanced Ammonium Nutrition on Morphological Characteristics and Dry Matter Accumulation of Cotton Seedlings
MA Tongtong1,2, CHEN Li1, WAN Hualong3, LI Jin1, LIU Liantao2, SUN Hongchun2, ZHANG Yongjiang2, BAI Zhiying1, LI Cundong2
1. College of Life Sciences, Hebei Agricultural University, Baoding 071001, China;
2. Key Laboratory of Crop Growth Regulation of Hebei Province, Hebei Agricultural University, Baoding 071001, China;
3. College of Agronomy, Hebei Agricultural University, Baoding 071001, China
Abstract:In order to provide references for nitrogen fertilization in field production, the effects of different NH4+/NO3- ratio of nitrogen nutrition (NH4+-N/NO3--N were 0/100, 25/75, 50/50, 75/25, 100/0)on morphological characteristics and dry matter accumulation, hydroponic experiments were conducted using Nongda 601 as material. The results showed that the plant height, stem diameter, leaf area and main root length of cotton increased gradually with the growth stages changed. In addition to the main root length showed a continuous elongation, the plant height, stem diameter, leaf area and dry weights of cotton increased firstly and then decreased with the increasing of NH4+ concentration in the ammonium nutrient solution. The plant height of cotton seedlings was the highest at the NH4+/NO3- ratio of 50/50 and 25/75 respectively 7, 14, 21 d after enhanced ammonium nutrient solution treatment;both stem diameter and leaf area were the largest at the NH4+/NO3- ratio of 50/50 after enhanced ammonium nutrition treatment 7, 14, 21 d, indicating that the concentration of NH4+ more than 50% could inhibit significantly the growth of cotton seedlings. In terms of dry matter, total dry weight, stem dry weight and leaf dry weight were the highest at the NH4+/NO3- ratio of 75/25, while there was no significant difference in root dry weight and root to shoot ratio, indicating that the effect of enhanced ammonium nutrition on the dry matter weight was positive mainly in the aboveground, while the effect in the underground was not obvious. Moreover, the ratio of root to shoot was the highest, the main root length was the longest when supplied with only NH4+, indicating that single NH4+ could promote root growth. All results showed that ammonium and nitrate nitrogen had different mechanisms for regulating growth and development in cotton underground and aboveground organs, mixed nitrogen was more favorable to the aboveground growth of cotton seedlings.
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