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頁籤選單縮合
題 名 | Application of Finite Mixture Distributions to Assess Factor, Timing, and Area of Yield Decrease in the Field Survey=應用有限混合分佈理論評估田間作物減產的因子,時期與面積 |
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作 者 | 張文亮; | 書刊名 | 農業工程學報 |
卷 期 | 38:4 1992.12[民81.12] |
頁 次 | 頁44-54 |
分類號 | 434.157 |
關鍵詞 | 田間; 有限混合分佈理論; 作物; 面積; 時期; 減產; |
語 文 | 英文(English) |
中文摘要 | 本文以差分法與貝爾方法,推估有限混合分佈曲線的機率特徵值,再由此設立判決參數將混合分佈區分為獨立分佈。應用此方法,分析一個以高鹽分與低鹽分混合再灌溉的高梁田,發現有40%的高梁減產,在種苗成活期間的缺水,其他有6%的減產下在孕穗期的灌溉不足。鹽分在此沒有造成玉米的減產,甚至有利於旱作灌溉,可能的原因是減低入滲率,增加土壤有效水分。 |
英文摘要 | The differences and Bayes methods were used to estimate probability features of mixture distributions. The results of estimation provide decision criteria to classify observed objects and to investigate relations of two mixture variables. Using saline and non-saline water to irrigate sorghum in growth period, 40% of the yields declined mainly by water-deficit in seedling period, and another 6% in booting period were found. Salt blend water used in irrigation can benefit yield by increasing water availability from decreasing infiltration. |
本系統中英文摘要資訊取自各篇刊載內容。