在田间小区遮雨条件下,采用有交互作用的双因素试验方法,设置了连续干旱0-32 d 7个水分处理及N 0、1402、80 kg/hm^23个氮肥处理,研究施氮水平对不同干旱程度夏玉米生长的影响。结果表明,轻度干旱条件下,随着施氮量的增加,夏玉米的株高...在田间小区遮雨条件下,采用有交互作用的双因素试验方法,设置了连续干旱0-32 d 7个水分处理及N 0、1402、80 kg/hm^23个氮肥处理,研究施氮水平对不同干旱程度夏玉米生长的影响。结果表明,轻度干旱条件下,随着施氮量的增加,夏玉米的株高、叶长、叶宽、茎粗等形态指标、生物量和产量都增加;中度干旱时,适量施用氮肥处理夏玉米的形态指标、生物量及产量均高于不施氮肥和大量施用氮肥处理;严重干旱时,随着施氮量的增加,夏玉米的形态指标、生物量和产量都呈逐渐下降趋势。本试验结果说明,施氮水平对不同干旱程度夏玉米生长有不同影响,应根据干旱程度选择合理的施氮量,以减小干旱带来的损失。展开更多
By means of the analysis methods of linear regression,climate tendency rate,integral humidity index and dry-wet index,precipitation,agricultural water demand and drought degree were analyzed systematically.The results...By means of the analysis methods of linear regression,climate tendency rate,integral humidity index and dry-wet index,precipitation,agricultural water demand and drought degree were analyzed systematically.The results showed that precipitation tendency rate in crop growing season was-19.983 mm/10 a in recent 50 years,and precipitation reduced by around 100 mm.60%-70% years had basically satisfactory precipitation and the satisfaction degree of natural precipitation towards agricultural water demand decreased by 23%.Due to precipitation decrease,climatic type changed from semi-humid and relative drought to moderate drought.The average water deficit was 56 mm in growth season and 36% years were affected by drought.Spring drought was the most serious with the probability of 64%,followed by autumn drought with the probability of 58%,and summer drought was the lightest with the probability of 24%.The drought probability from planting to seedling emergence in May was 70%,which had the greatest effect on agriculture production.展开更多
文摘在田间小区遮雨条件下,采用有交互作用的双因素试验方法,设置了连续干旱0-32 d 7个水分处理及N 0、1402、80 kg/hm^23个氮肥处理,研究施氮水平对不同干旱程度夏玉米生长的影响。结果表明,轻度干旱条件下,随着施氮量的增加,夏玉米的株高、叶长、叶宽、茎粗等形态指标、生物量和产量都增加;中度干旱时,适量施用氮肥处理夏玉米的形态指标、生物量及产量均高于不施氮肥和大量施用氮肥处理;严重干旱时,随着施氮量的增加,夏玉米的形态指标、生物量和产量都呈逐渐下降趋势。本试验结果说明,施氮水平对不同干旱程度夏玉米生长有不同影响,应根据干旱程度选择合理的施氮量,以减小干旱带来的损失。
文摘By means of the analysis methods of linear regression,climate tendency rate,integral humidity index and dry-wet index,precipitation,agricultural water demand and drought degree were analyzed systematically.The results showed that precipitation tendency rate in crop growing season was-19.983 mm/10 a in recent 50 years,and precipitation reduced by around 100 mm.60%-70% years had basically satisfactory precipitation and the satisfaction degree of natural precipitation towards agricultural water demand decreased by 23%.Due to precipitation decrease,climatic type changed from semi-humid and relative drought to moderate drought.The average water deficit was 56 mm in growth season and 36% years were affected by drought.Spring drought was the most serious with the probability of 64%,followed by autumn drought with the probability of 58%,and summer drought was the lightest with the probability of 24%.The drought probability from planting to seedling emergence in May was 70%,which had the greatest effect on agriculture production.
