Three big field projects, independent irrigation and drainage facilities, and a blocking net, which are auxiliary projects of a green planting and breeding pattern composed of rice and red swamp crawfish （Procambarus...Three big field projects, independent irrigation and drainage facilities, and a blocking net, which are auxiliary projects of a green planting and breeding pattern composed of rice and red swamp crawfish （Procambarus clarkii）, spatial and temporal coupling technology of ＂planting rice in one season and breeding red swamp crawfish in three seasons＂, green fertilization technology, green prevention and control technology, control technology of water level, and throwing technology of bait in Lixiahe region of Jiangsu Province were introduced successively, which can provide technical support for the development of ecological planting and breeding patterns and realization of green production in paddy fields.展开更多
In conditions of Poland, farewell-to-spring never was cultivated for cut flowers in unheated foil tunnel. Specific conditions of Lower Silesia, together with the short cultivation cycle and small demands of this plant...In conditions of Poland, farewell-to-spring never was cultivated for cut flowers in unheated foil tunnel. Specific conditions of Lower Silesia, together with the short cultivation cycle and small demands of this plant, are promised for its cultivation in this region of Europe. The aim of the study was to evaluate the usefulness of two farewell-to-spring varieties for the cultivation for cut flowers in unheated foil tunnel in Lower Silesia conditions during autumn time. The two-factorial experiment was carried out by the method of random blocks in Research-Development Station of Vegetable and Ornamental Plants of Wroctaw University of Environmental and Life Sciences. The first factor was the variety--＂Grace White＂ and ＂Brillanf＇ and the second was the year of cultivation--2012 and 2013. Measurements included number and length of flower stems, number of flower buds and leaves per flower stem, fresh and dry weight of flower stem and leaves color parameters. Total chlorophyll content was also determined. Studies showed that autumn cultivation of farewell-to-spring is reasonable because of its high yield （about 640 flower stems/m2） with long flower stems from 50 cm up to 80 cm. In Lower Silesia conditions, the variety ＂Grace White＂ has proven to be better; it produced higher number of flower stems with higher number of lowers buds and thus flowers. In terms of thermal conditions, more favorable was year 2013, in which the plants produced longer flower stems and had higher total chlorophyll content in leaves. After inserting the flower stems in tap water, all flower buds developed.展开更多
This study on dynamic changes of culture color, astaxanthin and chlorophylls, inorganic N including N NO - 3, N NO - 2 and N NH + 4 in batch culture of Haematococcus pluvialis exposed to different additive nitrate con...This study on dynamic changes of culture color, astaxanthin and chlorophylls, inorganic N including N NO - 3, N NO - 2 and N NH + 4 in batch culture of Haematococcus pluvialis exposed to different additive nitrate concentration showed (1) ast/chl ratio was over 0.8 for brown and red algae, but was usually less than 0.5 for green and yellow algae; (2) N NO - 3, in general, was unstable and decreased, except for a small unexpected increase in nitrate enriched treatment groups; (3) measurable amounts of N NO - 2 and N NH + 4 were observed respectively with three change modes although no external nitrite and ammonia were added into the culture; (4) a non linear correlation between ast/chl ratio (or color) changes and the levels of N NO - 3 , N NO - 2 , N NH + 4 in H. pluvialis culture; (5) up and down variation of the ast/chl ratio occurred simultaneously with a perceptible color change from yellow to brown (or red) when N NO - 3, N NO - 2 and N NH + 4 fluctuated around 30, 5, 5 μmol/L respectively; (6) existence of three dynamic modes of N NO - 3, N NO - 2 and N NH + 4 changes, obviously associated with initial external nitrate; (7) the key level of total inorganic N concentration regulating the above physiological changes during indoor cultivation was about 50 μmol/L; and (8) 0.5-10 mmol/L of nitrate was theoretically conducive to cell growth in batch culture.展开更多
基金Supported by Gaoyou Demonstration and Extension Base of Modern Agricultural(Rice and Wheat)Industrial Technology System in Jiangsu(SXGC[2017]168)Funds for Independent Innovation of Jiangsu Province(CX17(2007),KF(17)1022)+1 种基金Key Research and Development Plan Project(BE2017332)Agricultural Standardization Pilot Project of Jiangsu Province([2017]46)~~
文摘Three big field projects, independent irrigation and drainage facilities, and a blocking net, which are auxiliary projects of a green planting and breeding pattern composed of rice and red swamp crawfish （Procambarus clarkii）, spatial and temporal coupling technology of ＂planting rice in one season and breeding red swamp crawfish in three seasons＂, green fertilization technology, green prevention and control technology, control technology of water level, and throwing technology of bait in Lixiahe region of Jiangsu Province were introduced successively, which can provide technical support for the development of ecological planting and breeding patterns and realization of green production in paddy fields.
文摘In conditions of Poland, farewell-to-spring never was cultivated for cut flowers in unheated foil tunnel. Specific conditions of Lower Silesia, together with the short cultivation cycle and small demands of this plant, are promised for its cultivation in this region of Europe. The aim of the study was to evaluate the usefulness of two farewell-to-spring varieties for the cultivation for cut flowers in unheated foil tunnel in Lower Silesia conditions during autumn time. The two-factorial experiment was carried out by the method of random blocks in Research-Development Station of Vegetable and Ornamental Plants of Wroctaw University of Environmental and Life Sciences. The first factor was the variety--＂Grace White＂ and ＂Brillanf＇ and the second was the year of cultivation--2012 and 2013. Measurements included number and length of flower stems, number of flower buds and leaves per flower stem, fresh and dry weight of flower stem and leaves color parameters. Total chlorophyll content was also determined. Studies showed that autumn cultivation of farewell-to-spring is reasonable because of its high yield （about 640 flower stems/m2） with long flower stems from 50 cm up to 80 cm. In Lower Silesia conditions, the variety ＂Grace White＂ has proven to be better; it produced higher number of flower stems with higher number of lowers buds and thus flowers. In terms of thermal conditions, more favorable was year 2013, in which the plants produced longer flower stems and had higher total chlorophyll content in leaves. After inserting the flower stems in tap water, all flower buds developed.
文摘This study on dynamic changes of culture color, astaxanthin and chlorophylls, inorganic N including N NO - 3, N NO - 2 and N NH + 4 in batch culture of Haematococcus pluvialis exposed to different additive nitrate concentration showed (1) ast/chl ratio was over 0.8 for brown and red algae, but was usually less than 0.5 for green and yellow algae; (2) N NO - 3, in general, was unstable and decreased, except for a small unexpected increase in nitrate enriched treatment groups; (3) measurable amounts of N NO - 2 and N NH + 4 were observed respectively with three change modes although no external nitrite and ammonia were added into the culture; (4) a non linear correlation between ast/chl ratio (or color) changes and the levels of N NO - 3 , N NO - 2 , N NH + 4 in H. pluvialis culture; (5) up and down variation of the ast/chl ratio occurred simultaneously with a perceptible color change from yellow to brown (or red) when N NO - 3, N NO - 2 and N NH + 4 fluctuated around 30, 5, 5 μmol/L respectively; (6) existence of three dynamic modes of N NO - 3, N NO - 2 and N NH + 4 changes, obviously associated with initial external nitrate; (7) the key level of total inorganic N concentration regulating the above physiological changes during indoor cultivation was about 50 μmol/L; and (8) 0.5-10 mmol/L of nitrate was theoretically conducive to cell growth in batch culture.
