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題 名 | 甘蔗與其間作物間磷鉀養分競爭能力之研究 |
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作 者 | 張灝; 張晉華; 何逢偉; | 書刊名 | 中華農學會報 |
卷 期 | 67 1969.09[民58.09] |
頁 次 | 頁43-49 |
關鍵詞 | 甘蔗; 磷鉀養分; |
語 文 | 中文(Chinese) |
中文摘要 | (一)施肥位置不同與作物吸收肥量多少有密切關係。 (二)蔗田間作甘藷或花生時,以其吸收之肥料磷素及?素而言,主作物與間作物彼此影響不大。推想P32或Rb86施於蔗苗下方者,其兩側間作物甘藷或花生之根系作物分佈於表土層較多,故不易吸到蔗苗下方較下位之養分。P32或Rb86施於甘藷或花生下方者,兩側間作甘蔗之根系多向平側及斜側較下方之位置發展,故不易吸到較上方甘藷或花生下方所失之養分。 (三)當甘蔗間作甘藷時,主作物甘蔗或甘藷對P32及Rb86兩種養份之吸收均以初期為高,以後則呈遞減趨勢,但間作物吸收養分情形則成相反現象,?後期有遞增趨勢。至於甘蔗間作花生,無論主作物與間作物,於植後兩個月生長初期所吸收之肥分均較低,稍後則漸增。 (四)就植體內每克乾物重量對肥料磷素或?素之吸收量而言,甘蔗間作甘藷時在磷肥方面兩者相差無幾,面對?素之吸收量則甘藷高於甘蔗,此即表示甘藷需鉀肥較多。又當甘蔗間作花生時,甘蔗P32及Rb86吸收量均較花生偏高。 (五)甘蔗間作花生時,花生對甘蔗似無影響,甘蔗似能競取花生之養分。 (六)以B組與C組試驗相較,在相同條件下,以一般趨勢而言,其植體內每克乾物重量計,當甘蔗與花生間作時,兩者對磷素之吸收均較?素為多,甘蔗與甘藷間作時則反是,此或由於花生較需磷肥而甘藷則需鉀肥較多。 (七)綜上而論,甘藷與花生似均可視為甘蔗之適宜間作物,不致以間作而競取甘蔗之磷鉀肥養分,但間作花生時可酌量多施磷肥,間作甘藷時可酌量多施鉀肥。 |
英文摘要 | Since interplanting system has it's financial justification, sugarcane intercropping with other crops already has become a very popular practice in Taiwan. One of the important question is what are their competition for nutrients between main crop and intercrop? There are very few experimental data of reference values in this category. This paper presents results of studies on the use of P32 and Rb86 (to stand for potash) as a radiotracer to evaluate competition for nutrient between sugarcane and intercrop as affected by intercropping. The experiments was carried out by tank experiment using 2.5 mm ×8m ×1m concrete tank and with automatic irrigation by porous tubes to control soil to maintain over 80% of soil avarlable moisture for the good growth of crops. The experimental results may be summarized as follows. 1. Experimental data indicated that the development of rootlets of cane and intercrop extended in different layers of soil therefore there was less affected by intercrops for the uptake of nutrients P and Rb (or K). 2. When the sugarcane interplanted with sweet potatoes, the content of the percentage of P32 or Rb86 of main crop cane decreased steadity with the time of growth, but the percentage of P32 or Rb86 of intercrop increased steadity with the time of sampling. 3. When the sugarcane interplanted with peanut, the absorption of nutrients P32 or Rb86 (or K) by main crop and intercrop both increased steadity with the time of growth, this have some difference with the sugarcane interplanted with sweetpotato. 4. The pattern of fertilizer uptake was different with various crops. There are no difference of fertilizer P uptake between sugarcane and sweet potato but the amount of fertilizer Rb86 (or K) uptake by sweet potato is more than uptake by sugarcane. 5. When the sugarcane interplanted with peanuts, the absorption of nutrient P32 of Rb86 (or K) by sugarcane is both more amount than peanut, it means the peanut was less affected by interplanted. |
本系統中英文摘要資訊取自各篇刊載內容。