| Barley green is a kind of natural healthful nourishment enriched in the protein, mineral, enzymes, vitamins, chlorophyll, etc. For recent years, more and more research work has been done at home and abroad, and the production of barley tender leaves for processing barley green has been increasing. Tender leaves being the harvest organs, thus its production is quite different from that of malting and feedingstuff barley. However, the common malting and feedingstuff barley culture practices have still been adopted directly by fanners planting barley specially for processing barley green, which usually results in lower yield and quality. This experiment was conducted for two successive growth season (2000 and 2002) to select the cultivars suitable for barley green production with the characteristics such as flourishing seedling with much more tillers, high temperature tolerance, and high quality of fresh leaves rich in chlorophyll, protein, vitamins and mineral (for example, potassium) contents, and SOD activity. Furthermore, the optimal cultural practice, such as sowing date and fertilizer application, was studied for high yield and the improvement of quality, and the relationship between yield of barley tender leaves and major meteorological factors were analyzed. The results were as followers:1. According to special quality requirements of barley green to barley varieties, 58 varieties were primary selected from 100 cultivars introduced at home and abroad. Under field growing conditions, according to SPAD value and growth rate, 20 varieties were selected among these 58 varieties. Seedling yield and quality properties such as SOD activity, protein and potassium content of the 20 selected cultivars were determined. Two barley varieties fitted for producing barley green, enriching in protein and potassium and higher yield and SOD activity, were screened out in this study.2. This experiment was carried out to study the effect of sowing date on growth duration, yield and quality of barley leaves specially used for processing Barley Green. The results showed that with the postponing of sowing, the days of sowing to seedling and to the first harvesting stage were significantly prolonged, while the number of tillers per line of Hua-30 and Xiu 96-6 was significantly higher in the fourth sowing date (October 20) thanthat of others. The total leaves yield of three harvestings was significantly higher, with higher quality, in the third and fifth sowing date (October 10, and 30, respectively), compared with that of other sowing dates, while the quality such as content of chlorophyll, protein, vitamin C, potassium, SOD activity in the first (sowing on September 20) and fourth date was significantly higher than that of other sowing dates, and its yield is only lower than that of third and fifth sowing date. However, the yield and quality of sixth and seventh date (sowing on November 9, and November 19, respectively) are lower than that of other sowing dates. Therefore, the suitable sowing date of barley harvested for processing barley green is September 20, and October 10 to 30.3. The effect of climatic condition on yield of barley leaves used for processing of barley green and their relationship was determined by using two barley cultivars with seven sowing dates in Hangzhou. The results showed that the yield of first-term harvesting had a significantly positive correlation with the mean daily temperature of 10 days after sowing, while a significantly negative correlation with the total precipitation of the first and second ten days after sowing. Meanwhile, a significantly positive correlation was observed between the biomass yield of the second-term harvesting and mean daily temperature of the second 10 days and total precipitation of the third 10 days after first cutting, and as well as between the total yield and mean daily temperature of the second 10 days after sowing, while a negative correlation was found between total yield and mean daily temperature during 50-60d after sowing. Furthermore, curviline...
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