关键词: 甜菜, 甜菜, SPAD值, 氮素, 营养诊断

Abstract: In order to explore the texture and nutrition characteristics of soil in the Cabernet Gernischet planting areas in Yantai, Shandong Province, the researchers conducted the experimental investigation and analysis of 23 Cabernet Gernischet vineyards in four regions; indicators such as texture classification and nutrient content of soil were analyzed. The results are as follows: The soil in the Cabernet Gernischet planting area is coarse in texture, in which no fewer than 2mm gravels account for 10% or more; the soil is basically gravel soil; the soil that has no more than 2mm particles is mostly loam-type sandy loamy soil, accounting for 74.8% of all soil samples. The soil that has less than or equal to 2mm particles, mainly consists of coarse sand (2~0.2mm) and fine sand (0.2~0.02mm), which totally account for 80%. In the planting areas, the content of organic matters contained in the soil is low, averagely accounting for 0.82%; in terms of grade proportion in nutrient content, the content of organic matters is mainly concentrated at the moderate and low level, respectively accounting for 34.8% and 39.2%. The pH value of soil is 6.03, that is slightly acidic. The content of alkali-hydrolyzable nitrogen is 31.11 mg/kg, and mainly concentrated at the extremely low level, accounting for 88.4%. The content of available phosphorus is 16.44 mg/kg, the proportion of low level is 53.62%. The content of available potassium is 105.76 mg/kg, the proportion of low level is 46.4%. Available copper content is 0.46 mg/kg, the proportion of medium level is 59.4%. Available zinc is 0.54 mg/kg, the proportion of low level is 52.2%. Available Fe is 19.05 mg/kg, the proportion of high and proper level is 44.9% and 49.3%. The variation coefficients of content of available nutrients in the soil are ordered: Cu> P> K > N> Mg> Zn > Ca> Fe. As the coefficient of variation of Cu reaches 113.14%, it is strong variation. The average PH value of soil in Penglai is 5.56, and its variation amplitude was 4.43~6.68, obviously showing the trend of acidification, and the content of exchangeable calcium and magnesium are low.