石刁柏留莖採收試驗報告（第二報）

Studies on 'Mother Stalk Method' of Asparagus Harvesting (2nd Report)

一、石刁柏在採收初期不留莖，則其隔莖產量之多寡與採收前之冬期休眠情形有關、冬期1月，2月低溫有利於休眠，春季隔經產量必豐；故冬期休眠度之深淺決定初期嫩莖的產量。二、若春秋兩季皆完全不留莖對於翌年期嫩莖產量深具影響。但如僅春季採收一次則翌對年產量所具之影響較微，惟其全年產量仍低於留莖區。如採用折衷式的有限度的留莖與不留莖相互配合則對於產量影響較微。三、不留莖區莖採收2個月後嫩莖開始細小，產量減低，但留莖無論留二枝或留三枝，非但全年各月之產量較為平均，且夏季7、8月間所產生嫩莖單支個體之平均重量亦增高。四、二枝或三枝留莖處理間之產量分析結果不顯著，單收嫩莖平均重量亦無差異。但淺度休眠留三枝產留二枝為佳，可推測在氣溫較高之南部因淺度休眠或不休眠，故其留莖數應較北部為多。五、不留莖採收之期限在北部以不超過8星期為宜，台灣南部似宜斟酌縮短。

1. Over a 3-year period the experiment was conducted at Taipei District Agricultultural Improvement Station. It was proven that without mother stalk harvesting the total yield was the lowest among the treats, but the first two months of its yield was greater than others. It was quite related to the temperature of winter season. In case that December is warm and constantly cold enough from January to February, it increased the yield in spring due to a good vegetative growth after fall harvesting and a favorable dormant period before harvest in spring. 2 Further study made with the method without mother stalk harvesting, there was evident in the case of two seasons of harvesting in spring and fall which caused reducing the yield of the next year greatly, and one of spring season harvesting did not much affect the spring yield of the next year. But the total of its yield and quality were still less than the mother stalk method of harvesting. 3 The yield comparison of mother stalk method with the combined method harvesting was not greatly different. In order to avoid the weakness of the plants it is essential in combined method harvesting to reserve the stalks before the spear does not decrease to an unmarketable size for a continuous harvest up to October of the year. 4. According to analysis, the effect number of mother stalks has no significance between 2-stalk and 3-stalk which was reserved during the time of harvesting. But there was a slight tendency in case of a warmer winter of the year that 3-stalk reservation produce more yield. From the results of this experiment, it is advisable to reserve more stalks with definite numbers in sonthern Taiwan because of their warmer winter. 5. For labor saving the combined method harvesting may be practical, and the period without mother stalk does not go beyond eight weeks according to the data. The author estimates, the time without mother stalk is short in the middle and the southern part of Taiwan due to insufficient dormancy of plants in winter. It is also really hard to practice in Pin-tong area where the vegetative growth of plants is ceaseless all the year round.