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研究了不同施肥比例与不同施肥水平的烟株根系发育特征 ,以及根系发育特征与烟叶产量品质的关系。结果表明 ,同一施肥比例 ,施肥水平越高 ,根系重量越大 ,细根差异尤为明显 ,淋溶褐土与普通棕壤均以 N∶ P2 O5:K2 O为 1∶ 2∶ 3的高氮素水平 (淋溶褐土 90 kg/hm2 ,普通棕壤1 0 5kg/hm2 )的总根重量最大 ,对照总根重量最小。同一施肥比例 ,存在根系重量越大 ,产量越高 ,上中等烟比例越低的趋势。淋溶褐土以 N∶ P2 O5∶ K2 O为 1∶ 2∶ 2的 90 kg/hm2 氮素水平的产量最高 ,上中等烟叶比例最大 ;普通棕壤以 N∶P2 O5∶K2 O为 1∶ 1∶ 2的 90 kg/hm2氮素水平的产量最高 ,上中等烟叶比例最大
The root development characteristics of tobacco plants under different fertilization rates and different fertilization levels were studied, as well as the relationship between the root development characteristics and the yield and quality of tobacco leaves. The results showed that with the same fertilization rate and fertilization level, the greater the root weight, the more obvious the difference of fine roots. The highest nitrogen level of N: P2 O5: K2 O was 1: 2: 3 in both leaching brown soil and common brown soil The total root weight of horizontal (leached brown soil 90 kg / hm2, normal brown soil 105 kg / hm2) was the highest, and the control total root weight was the smallest. The same proportion of fertilization, there is a greater root weight, higher yield, the lower the proportion of upper-middle-class tobacco trend. The leached brown soil had the highest yield of nitrogen at 90 kg / hm2 N: P2 O5: K2 O at the ratio of 1: 2: 2, with the highest ratio of middle and upper leaves. The average brown soil was N: P2 O5:K2O at 1: The yield of 1: 2 at 90 kg / hm2 nitrogen level was the highest, with the highest proportion of middle-grade tobacco leaves