Vetiver grass (Chrysopogon zizanioides L.) has an ability to adapt and develop in many different environments and to recover quickly from the disadvantage conditions of the environment. It can absorb large amounts of nitrogen, phosphorus and dissolved heavy metals in the environment. Studies to date on salt tolerance of vetiver grass have been conducted mainly in the soil environment and much less so in the aquatic environment. Therefore, a full study on sea water salinity tolerance of vetiver is needed to solve problems of pollution in estuaries-where water quality is often affected by the activities of humans as well as those of industrial and agricultural productions, which have increasingly become more acute. This paper presents results of research on the growth of vetiver affected by the level of sea water salinity. The research results showed that vetiver grass is capable of growing in sea water salinity ranging from 0 to 19.64 dS/m (0-11‰).
Effects of environmental factors on the growth and development of tomato plants in greenhouse cultivation were investigated. Tomato (Lycopersicon esculentum Mill. cultivar “Momotaro”) was cultivated by solution culture system using solid medium from November 2017 to May 2018 in the glass greenhouse with 66.43 m2 of floor area. Environmental factors including temperature, humidity, light intensity and CO2 concentration in the greenhouse were recorded every 10-minute during cultivation. Mathematical models were developed to fit the data to determine the relationship between environmental factors and the growing parameters of tomato plants. It was observed that the percentage of flowers translated into fruits and clusters tended to decrease in upper clusters on tomato plants. Fruit yield was estimated at about 31 kg/m2 and 5.56 kg/plant, and fruit weight varied among plants from 3.73 kg to 7.34 kg. Mathematical modelling using measured indices represented moderate significant relationships between start ripening date (SRD), harvesting date (HD), and cumulative heat unit (CHU), and cumulative light intensity (CLI) as R2 = 0.67, between cluster occurrence and CHU as R2 = 0.69.
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