Effects of different organic materials on growth, nutrient absorption, yield and quality of cigar in Hainan

【Objective】 To analyze the effects of different organic materials on growth, nutrient absorption, yield and quality of cigar, and to provide reference for further scientific application of organic materials in Hainan cigar tobacco planting area.【Method】 A field experiment was carried out to determine and analyze the agronomic characters, leaf SPAD value, dry matter accumulation, nutrient absorption, yield, and quality of cigar tobacco under five treatments:chemical fertilizer (YJ1), Sesbania cannabina green manure + chemical fertilizer (YJ2), decomposed sesame cake fertilizer + chemical fertilizer(YJ3), decomposed rapeseed cake fertilizer + chemical fertilizer(YJ4), and Moergen biofertilizer + chemical fertilizer(YJ5).【Result】 The agronomic characters of YJ3 and YJ4 treatments were better than those of YJ1 treatment at the vigorous growing stage and the maturing stage. The leaf SPAD values of YJ3 treatment were significantly higher than those of YJ1 treatment at all stages(P<0.05, the same below), and those of YJ4 treatment were significantly higher than those of YJ1 treatment at the vigorous growing stage. 47-62 d after transplanting, the dry matter accumulation and accumulation rate of the whole plant of each organic material treatment were significantly higher than those of YJ1 treatment, YJ3 and YJ4 treatment had higher total dry matter accumulation, which increased by 60.87% and 45.26%, respectively compared with YJ1. At 84 d after transplanting, total dry weight of the whole plant, dry weight of root, stem and leaf of YJ4 and YJ3 treatments were also significantly increased. The treatments of organic materials promoted the accumulation of nitrogen, phosphorus, potassium, calcium, magnesium, sulfur in tobacco plants, and the highest accumulation of nitrogen, phosphorus, potassium were YJ3, YJ5, and YJ4 respectively. The yield of cigar leaf and wrapper tobacco of YJ4 and YJ5 treatments were significantly higher than YJ1 treatment, the increase rates of YJ4 treatment were 39.34%, 52.78%, respectively. The yield of output rate of cigar wrapper tobacco of YJ3 treatment was the highest, which was 12.44% higher than YJ1 treatment. The appearance quality of tobacco leaves of each organic material treatment were better than that of YJ1 treatment, the total scores of YJ4 and YJ3 treatments were significantly increased by 6.95% and 6.04% compared with YJ1 treatment respectively, and the blade structure, oil content of the two treatments were significantly higher than those of YJ1 treatment. The physical characters of tobacco leaf of YJ4 treatment were better overall.【Conclusion】 The applications of organic materials can improve the agronomic characters of cigar tobacco plants, promote dry matter accumulation and nutrient absorption, increase tobacco leaf yield and output rate of wrapper tobacco, improve the appearance and physical characters of tobacco leaves, and make the chemical components contents of tobacco leaves more suitable. The application of decomposed rapeseed cake fertilizer is more effective, and it can be popularized in Hainan cigar tobacco planting area.