鳳梨園更新老株處理試驗

Experiment on the Treatment of Old Plants of Pineapple Orchard

（一）本試驗分別於本分所及臺南區改良場新化工作站兩處同時舉行，於55年2月間（春季）及9月間（秋季）將鳳梨老株處理，並於9月栽植，共5種處理，重複3次，完全隨機區組設計，鳳梨生育滿一年時，每處理區之一半使用百分之一濃度電石水，促進春果抽種，5種處理如下：A．於春季將鳳梨老株掘除，埋於土內30公分處。B．於春季將鳳梨老株掘除，切成碎片覆蓋地面，至秋植期。C．於春季將鳳梨老株掘除，然後種植綠肥作物。D在鳳梨種植前，將鳳梨老株熒毀，且立即埋入土內30公分處。E.在鳳梨種植前。將鳳梨老株掘除移出。（二）植株生育情形：以春季不行整地老株處理之E處理及B處理生育較差，但不顯著。（三）萎凋病發生情形：兩地區之萎凋病發生均以D處理發生最多，C處理最少，其差異為4.3%及5.0%，均達大於1%顯著標準，A處理區之萎凋病發生仍顯著較少，由此可證明才株鳳梨園更新，於春季老株掘取移出田外，整地種植綠肥（C處理）或於春季將老株掘取，埋入土內至秋其（A處理）栽植鳳梨對萎凋病之發生較少。（四）果實產量：無論春夏果，兩地區之果實產量均以A處理最高，C處理次之，E，D處理較差，B處理最差，其差異均達大於5%或1%顯著標準，加以兩地區各種處理之春夏產量合計觀之，則A處理之1, 961公斤最高，C處理之1,899公斤次之，E處理之1,695公斤較差，D處理及B處理之1,635公斤～1,587公斤最差，即A處理及C處理比E處理增產15%及12%，再以D、處理及B處理之1.635公斤～1,587公斤最差，即A處理及C處理比E處理增產15%及12%，再以D、B處理比較時增產22.0%~15.5%之間。（五）果實品質：果肉顏色深黃色者為優良，無論春夏果，均以C處理區及A處理較多，果心之粗細及糖度則無甚差異，惟酸度以D處理區顯著較高。

This experiment was carried out both at this Experiment Station and Tainan District Agricultural Improvement Station since 1966. The removal of and treatment of Old pineapple plants in February and September, 1966 respectively. The new pineapple seedlings were planted in September with five different treatments, arranged in random with three duplications. Till the seedlings grow just one year, the one-half of the plots use 1% Calcium Carbide (Ca C2) as the growth promoting substance to promote the blooming and heading of Spring crop of pineapple 1. The five different treatments of Old pineapple plants are as follows; (1) To dig the Old pineapple plants in the spring and then buried in the depth of 30 Cm, below the horizon. (2) After dug the Old pineapple plants, cut into pieces and then covered on the land before the planting of seedlings in autumn. (3) Dug the Old pineapple plants and then plant the green manure crops on the same land. (4) Before the planting of seedlings, the Old pineapple plants Should be burned, and buried immediately lute the soil of about 30 Cm. depth below the horizon. (5) Before the planting of seedlings, dug the Old pineapple plants and removed them away. 2. The growth of the new pineapple plants: The new pineapple plants grew well in the Old plants removed land, except the treatments 5 and 2, they grew bad, but it showed no significant difference. 3. The Outbreak of Pineapple wilt: Concerning the occurrence of wilt, the treatment 4 appeared seriously among them, but the treatment 3, the wilt percentage was lowest, their difference was 4.3 and 5.055, being much above 155 level of statistically significant. While the wilt percentage of treatment 1 was also low. It may be concluded that the renewal of Old pineapple plants of the pineapple orchard, however, either we dug the Old plants in spring, buried into the land, Preparation of the soil, then plant the green manure crops, (Treatment 3), or we dug the Old plants in spring and buried into the land till the autumn planting (treatment 1), the wilt would be less appeared. 4. The yield of fruits: No matter the fruits of spring crops or summer crops of pineapple, the treatment 1 gave the highest yield, weighed 1,961 kg.; followed was treatment 3, 1,899 kg. in weight; the third was the treatment 5, weighed 1,695 kg; and the tratment 4 and treatment 2, only 1,635 and 1,587 kg. respectively were the lowest among them. The difference was much above 5% or 1% level of statistically significant With respect to the yield of fruits it was shown that the treatments 1 and 3 were increased in production about 15% and 12% than the treatment 5, If the former treatments compared with treatments 4 and 2, they increased in production about 15.5%-22.0% 5. The Quality of fruits: In general we considered the deep yellow color of the pineapple flesh is the best color. In this experiment the fruits of treatments 3 and 1, were largely appeared that color, but the size and sugar content (measured by Brix hydrometer) of the center part of fruits have no signigicant difference The acidity of treatment 4 was apparently higher than other treatments. This Experiment was supported by the National Council on Science Development.