摘要
为研究生物炭对不同磷肥用量条件下糜子生长发育的影响,本试验采用大田小区试验,设置四个磷肥用量0 kg/hm2、50 kg/hm2、100 kg/hm2、150 kg/hm2(P0、P50、P100、P150),每个磷肥用量下设对照(CK)和生物炭(BC,15 t/hm2)添加处理,共8 个处理.结果表明:(1)糜子的株高、茎粗、叶片形态指标随着磷肥施用量的增加先升高后降低;与对照相比,P100+BC(P2O5,100 kg/hm2,BC,15 t/hm2)处理下的糜子株高、茎粗以及叶片的表面积、叶长、叶宽最佳,说明施加生物炭处理可以显著提高糜子的地上生长指标.(2)糜子的根系指标数据随着磷肥施用量的增加先上升后降低;与对照处理相比,施加生物炭可以显著提高糜子的根系表面积、根长、根体积以及根平均直径,其中P100+BC处理糜子根系生长的最好,根表面积、根长、根体积以及根平均直径分别为 218.87±14.31 cm2、853.59±32.12 mm、5.34±0.65 cm3、0.99±0.14 m,与对照相比分别提高了19.94％、26.90％、26.84％和32.03％.(3)与对照处理相比,添加生物炭可以显著提高糜子的生物量和产量,P100+BC处理的糜子生物量和产量最高,产量最高为2911.76±56.33 kg/hm2,比P100+CK增产23.01％.综上所述,在磷肥用量100 kg/hm2 条件下,生物炭的添加对糜子生长发育的影响最显著.
Abstract
In order to study the effects of biochar on the growth and development of corn millet under different phos-phorus fertilizer dosages,a field plot experiment was conducted in which four phosphorus fertilizer dosages 0 kg/hm2,50 kg/hm2,100 kg/hm2,150 kg/hm2(P0,P50,P100,P150)were set.Each phosphorus fertilizer dosage treatment included contros(CK)and biochar(BC,15 t/hm2)addition treatment,a total of 8 treatments.Results show that(1)the corn millet plant height,stem thickness,leaf shape index of agronomic traits increase with the in-crease of applying phosphate content presented lower after increase first,and P100 + BC(P2O5,100 kg/hm2,BC,15 t/hm2)processing of corn millet plant height,stem diameter and leaf area,leaf length,leaf width;could significantly increase.(2)The root index data of corn millet first increased and then decreased with the increase of phosphorus fertilizer application;Compared with the control treatment,biochar treatment significantly improved root surface area,root length,root volume and mean root diameter of corn millet.The root surface area,root length,root volume and mean root diameter of corn millet treated with P100+BC showed the best root growth,and the root surface area,root length,root volume and mean root diameter were 218.87±14.31 cm2,853.59±32.12 mm,5.34±0.65 cm3,0.99±0.14 mm,respectively.Compared with the control treatment,it was increased by 19.94％,26.90％,26.84％and 32.03％,respectively.(3)Compared with the control treatment,biochar addition significantly increased the biomass and yield of corn millet.The highest biomass and yield was 2911.76±56.33 kg/hm2 under P100+BC treatment,which was 23.01％higher than that under P100+CK treatment.In conclusion,under the condition of a Phosphorus fertilizer dosage of 100 kg/hm2,the addition of biochar has the most significant effect on the growth and development of corn millet.
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