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作物前茬对肥料效应的影响 总被引:1,自引:2,他引:1
根据在甘肃河西灌区进行的肥料长期定位试验结果探讨了前茬对后作施肥效应的影响,发现在小麦—小麦—玉米轮作中,玉米茬小麦的施肥效应明显大于小麦茬玉米的施肥效应,并分析了造成这种差异的主要原因。 相似文献
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为探索适宜烤烟生长的前茬作物,完善烤烟的种植制度,以烤烟连作为对照,研究了玉米(T1)、豆类/蔬菜(T2)和土豆(T3)三种前茬作物对烤烟成熟期农艺性状、根系发育、生物量和土壤养分含量的影响。结果表明,所有农艺性状指标中数值最高的是均为T2 处理,根深度和水平根宽度由高到低的处理顺序为T2>T3>T1>CK,根、茎、叶干物质重从高到低的处理顺序也为T2>T3>T1>CK;土壤养分中pH值、有机质含量、碱解氮含量从高到低的处理顺序为T2>T1>T3>CK。综上,适宜烤烟生长的前茬作物为豆类/蔬菜,其次为土豆。 相似文献
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In order to study the effect of different preceding crops on soil fertility in tobacco growing areas, 166 soil samples were collected from Pingqiao tobacco growing area for nutrient determination. The analysis results show that: ① The overall soil pH value is at an appropriate level (5.5~7.0), the degree of soil acidification in the corn preceding crop is generally high, and the pH value in the peanut preceding crop is mostly at an appropriate level. ② The overall soil organic matter is at a suitable but low level. 83.33% of the soil organic matter content in the previous crop of tobacco leaves is at an appropriate level, while most of the soil organic matter content in the other previous crops is at a low level. It is necessary to supplement organic fertilizer in a timely manner. ③The alkaline nitrogen content in the soil of different previous crops exceeds 100mg/kg, which is above the average level. The application amount of nitrogen fertilizer should be controlled.④The soil available phosphorus content is relatively high in the previous crop of rice, while the rest are at an appropriate level, but the coefficient of variation is relatively large. ⑤The average content of soil available potassium is at an appropriate level, and the proportion of soil available potassium content in the previous crop of peanuts is the highest at an appropriate level, at 83.64%. ⑥The chloride ion content in the soil of the tobacco planting area is at the average level except for the previous crop of rice, but overall, the proportion of chloride ion content is relatively high. Therefore, comprehensive fertilization should be timely regulated s to regulate the proportion of chloride ions during the planting process.⑦Targeted fertilization suggestions were proposed for different previous tobacco fields. 相似文献
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不同土壤类型前茬作物对烤烟化学成分和品质的影响 总被引:1,自引:0,他引:1
《湖南农业大学学报(自然科学版)》2015,41(5)
研究了云南省陆良县红壤和水稻土前茬作物(小麦、蚕豆、绿肥、油菜)对烤烟主要化学成分和评吸质量的影响。结果表明:在水稻土条件下,相较休耕处理,前作为小麦和蚕豆时,烤烟总糖、还原糖含量适中,总氮、烟碱含量显著降低,以小麦为前作时,总氮含量仅为1.5%,烟碱含量低于2%,烤烟的感官质量评析以前作小麦和油菜最优,香气质较好,杂气少,香气风格得分均达到5,清香风格明显;在红壤条件下,以绿肥为前作时,烤烟化学成分最优,烤烟钾含量达2%以上,高于其他前作处理,烟碱含量仅为1.81%,低于以小麦、蚕豆、油菜为前作的处理,烟叶的评吸质量也以绿肥为前作时最优,烤后烟叶香气量足、燃烧性好、清香风格最明显。水稻土条件下前作为小麦,红壤条件下前作为绿肥较为适宜。 相似文献
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为进一步摸索适合我县以棉花为主要作物的多熟高效种植模式,5月上中旬,对我县产棉乡镇"蚕豆~棉花"、"玉米~棉花"、"蔬菜~棉花"与"油菜~棉花"栽培模式的前作经济效益情况开展了对比调查. 相似文献
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对酉阳县苍岭基地单元不同前茬作物的植烟土壤肥力特征进行了研究。结果表明,①前茬作物为玉米的植烟土壤:88.24%的土壤样品pH适宜于烟株的生长,土壤碱解氮含量位于适宜范围内的土样所占比例为11.76%,29.41%的土壤样品速效磷含量位于烟株生长的适宜范围,58.82%的土壤样品速效钾含量低于150 mg/kg,有机质含量的平均值为14.97 g/kg,土壤中氯离子含量为10~30 mg/kg的土壤样品所占比例为58.82%。②前茬作物为蔬菜的植烟土壤:土壤pH都适宜于烟株生长,碱解氮含量都不适宜于烟株生长,33.33%的土壤样品速效磷含量位于适宜范围,土壤中速效钾含量低于150 mg/kg的土壤样品所占比例为50%,土壤有机质含量的平均值为16.91 g/kg,66.67%的土壤样品氯离子含量位于烟株生长的合适范围内。③前茬作物为烟草的植烟土壤:20.78%的土壤样品pH不适宜于烟株生长,仅有5.2%的土壤样品碱解氮位于适宜范围内,62.34%的土壤样品速效磷含量不适宜于烟株生长,53.25%的土壤样品速效钾含量在适宜于烟株生长的范围内,有机质平均值为15.53 g/kg,氯离子含量为10~30 mg/kg的土壤样品所占比例为68.83%。④针对土壤养分含量状况提出了一些相应的应对措施。 相似文献
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八五五农场土地多为自浆土,具有板、僵、冷、凉、通透性差、土壤肥力低的特点,同时由于耕地多处于丘陵漫岗地带,具有易排水的的特点,因此红小豆已成为农场主要种植的经济作物之一。为探讨在相同栽培和管理条件下,不同茬口对红小豆产量的影响,进一步指导农业生产、为合理轮作提供理论依据,特进行此项试验。 相似文献
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