Difference of yield, spear head tightness and a spear elongation between asparagus (Asparagus officinalis L.) cultivars and other related characteristics
2007
Motoki, S.(Nagano-ken. Vegetable and Ornamental Crops Experiment Station (Japan)) | Matsunaga, K. | Maeda, T. | Kutsuzawa, T. | Kitazawa, H. | Usui, T.
The aim of this research was to select asparagus (Asparagus officinalis L.) cultivars with high quality, high yield, good spear elongation, high tolerance to diseases, spear head tightness and good adaptation to cold areas of Japan. The comparative trial of asparagus cultivation, established at Nagano Vegetable and Ornamental Crops Experimental Station, included 17 green cultivars and 5 purple cultivars. On a yearly basis the following traits were scored: spear yield, spear head tightness and commercial characteristics of the spear, number, height and size of the stem, weight of the canopy, a day's elongation of spears, disease tolerance, earliness of spear emergence in the spring. Based on the data of spear yield, plant characteristics and disease tolerance for three years, the cultivars 'Grande', 'Jersey Giant', 'NJ953', 'Gijnlim' and the Japanese hybrid 'Cyoyakou No. 38' were considered to be the most promising. 'Gijnlim' had problems with spear head tightness for summer and autumn harvests. We are expecting to get better varieties for open fields in the cold areas of Japan, but at the same time, we need to check the adaptability of each variety to the environmental and soil conditions of each asparagus producing district. These data were taken only from 1-3 year old plants. We need to continue analyzing our trial, considering the influence of diseases on the next season yields in open fields under humid temperate climates.
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