Study on Nutritional Characteristics of Dianjiang Peony at Different Growth Stages

[Objective] This study aimed to investigate the nutritional characteristics of Dianjiang peony at different growth stages.[Method] The yield,nutrient content and nutrient uptake of Dianjiang peony at different growth stages and available nutrient content in soil were investigated by field survey and indoor chemical analysis.[Resuit] The results showed that biomass,leaf weight,tender stem weight and cortex moutan weight （yield） of 1-4 years old peony exhibited a significant quadratic regression relationship with the cultivation duration.The average content and uptake of 12 nutrients in leaves exhibited an overall order of Ca＞N＞K＞Mg＞S＞P＞Fe＞Mn＞ Zn＞Cu,which was consistent to that in tender stems.However,the average content and uptake of various nutrient elements in cortex moutan exhibited an overall order of N＞Ca＞K＞Mg＞P＞S＞Fe＞Zn＞Cu＞Mn,which was different from that in leaves and tender stems.In addition,the average content and uptake of various nutrient elements in petioles exhibited an overall order of Ca＞K＞N＞Mg＞S＞P＞Fe＞Mn＞Zn＞Cu.The content of organic matter in soil of Dianjiang peony at different growth stages varied greatly; to be specific,contents of N,S,Mn and Zn were higher.[Conclusion] This study provided theoretical basis for the production of high-quality and high-yield peony.

Effects of Modulation Methods on the Drying Characteristics and Nutritional Quality of Medicago sativa Hay

Two-year-old Medicago sativa at budding initial stage was taken as research materials.Five methods were used to make green hay,including flatting stems ＋ spraying 2.5% K2CO3,flatting stems,sun curing,drying in shade and drying under 105 ℃ condition（CK）.Besides,effects of different green hay making methods on dry characteristics and nutritional quality of M.sativa green hay were studied,and a comprehensive evaluation of M.sativa green hays was conducted.Results showed that,except CK,the drying rates in other making methods were all fast at first,and then slow down.Both of drying under 105 ℃ condition and flatting stems ＋ spraying K2CO3 could speed up drying rate and reduce nutritional losses of green hay.Sun curing could also speed up drying rate,but it could not maintain the quality of green hay.The results of Grey Relational Analysis on five green hay making methods indicated that CK had the best comprehensive performance,followed by green hays made by flatting stems ＋ spraying K2CO3.Therefore,flatting stems ＋ spraying K2CO3 was a quick and easy method to make green hay,and it was worth to be recommended in practical production.

Nutritional Properties and Fertilizer Demand Rules of Young Phoebe bournei Forest

This study aimed to investigate the absorption characteristics of nitrogen, phosphorus, potassium, calcium and magnesium and rules in fertilizer demand by young Phoebe bournei forest. The results showed that the nitrogen, phosphoruS, potassium and magnesium contents in young Phoebe bournei leaves were increased with the proceeding of growth, but the calcium content was increased. During the growth period, the nitrogen, phosphorus, potassium and magnesium contents were relatively high in June, July and August. This study will help to understand the nu- tritional characteristics and fertilizer demand rules of young Phoebe boumei forest, thereby providing scientific theoretical guidance for application of fertilizer in Phoebe bournei.

Varietal Characteristics and Nutrition Characteristics of Several New Varieties of High Biomass Sugarcanes for Sugar and Energy

[Objective] The aim was to study the varietal characteristics of six new varieties of high biomass sugarcanes for sugar and energy namely GT02-833,GT97-69,GT02-351,GT03-2287,B9 and GT02-770,as well as the nutrition characteristics of them under drip irrigation conditions. [Method] Industrial and agronomic characters,total N,total P,total K and chlorophyll content were determined. [Result] Cane yield,total biomass yield and sugar content of six varieties were more than 180,200 and 25 t/hm2 respectively,which were higher than that of the control Xintaitang 22. The total nitrogen and total phosphorus contents of six varieties were high and persistent from Jul to Nov,but they decreased sharply in Dec. Total potassium content of all varieties increased from Jul to Dec. Chlorophyll content of all varieties were high from Aug to Oct,but they decreased sharply in Nov. Total nitrogen,total phosphorus and total potassium content of GT02-833,GT97-69 and B9 were higher than that of CK. [Conclusion] GT02-833,GT97-69 and B9 had characteristic of efficient use of nutrients,thus should be extended as elite varieties.

Comparison of Physicochemical,Organoleptic and Nutritional Abilities of Eight Sweet Potato(Ipomoea batatas)Varieties

In Martinique (F.W.I.), biodiversity of vegetable varieties remain unexploited due to public unawareness or supply problems. To further enhance the sweet potato, physicochemical, sensory and nutritional characteristics of eight varieties of sweet potato were established. The eight sweet potatoes cultivars were noticeably diverse with phenotypic, sensory, physicochemical and nutritional characteristics which were very varied. The eight cultivars grown in Martinique were advantageously positioned in relation to the globally identified sweet potato, regarding fibre, starch, potassium, copper, vitamin B1, B3 and B9 contents. Compared to the ordinary potato, Martiniquan sweet potatoes have a much better nutritional potential. Energy value and vitamin C levels were twice as much as in normal potatoes. Martiniquan sweet potatoes cultivars were also richer in minerals and vitamins, with 2.7 times more vitamin B9 and 63 times more beta-carotene than the ordinary potato.