scholarly journals Population density, multiple harvesting, and ability of Ipomoea reptans to compete with native weeds at tropical wetlands

2020 ◽  
Vol 21 (9) ◽  
Author(s):  
Benyamin Lakitan ◽  
KARTIKA KARTIKA
Keyword(s):  
Population Density ◽  
Fertilizer Application ◽  
Tropical Wetlands ◽  
Bottom Part ◽  
Fast Growing ◽  
Spad Value ◽  
Native Weeds ◽  
Water Saturated ◽  
Marketable Size

Abstract. Lakitan B, Kartika K. 2020. Population density, multiple harvesting, and ability of Ipomoea reptans to compete with native weeds at tropical wetlands. Biodiversitas 21: 4376-4383. Despite as a nutritious, fast-growing, and well-adapted leafy vegetable at tropical wetlands; Ipomoea reptans has not been intensively cultivated yet. This study was designed for increasing productivity of this vegetable by optimizing population density, extending harvesting period, and its ability to compete with native weeds at tropical wetlands. Bottom wet culture system (BWCS) was implemented by placing all pots within 2 m x 4 m experimental pool filled with water to 2-cm depth to make sure bottom part of the substrate within each pot was continuously water-saturated. Results of this study indicated that despite fluctuated yield at each harvest, accumulative yields after five consecutive harvests were not significantly different among population densities from 14 to 71 plants per m2. Yet, quality of yield in most cases was better in lower population density treatment (14 plants per m2), as indicated by SPAD value and marketable size of individual plants. Frequent NPK fertilizer application was effective for increasing yield. The first harvest was done at 4 weeks after seed sowing; thereafter, the plants were routinely re-harvested at about every week. This fast-growing vegetable also exhibited ability to compete with native weeds commonly found at tropical wetlands at density up to 11.3 mg cm-2.

Effects of planting densities and fertilizer application levels on the main quality of Xiangzayou763

2011 ◽  
Vol 37 (3) ◽  
pp. 318-320
Author(s):  
Ji-yue WANG ◽  
Hai-xing SONG ◽  
Chun-yun GUAN ◽  
Qiang LIU ◽  
Xiang-min RONG ◽  
...  
Keyword(s):  
Fertilizer Application

Tuberculosis epidemic situation in the Khabarovsk Krai: status and trends

2021 ◽  
Vol 87 (1) ◽  
pp. 17-24
Author(s):  
K.P. Topalov ◽  
◽  
O.L. Karpenko ◽  
E.G. Kovalyova ◽  
◽  
...  
Keyword(s):  
Population Density ◽  
Federal District ◽  
Khabarovsk Krai ◽  
Its Regions ◽  
Status And Trends ◽  
The Russian Federation ◽  
Far Eastern ◽  
Statistical Indicators ◽  
Tuberculosis Care

The article presents an overview of the data of statistical observation of the Khabarovsk Krai, the Russian Federation and the Far Eastern Federal District (Okrug) on tuberculosis; their significance for assessing the epidemic situation and the quality of anti-tuberculosis care in these territories in 2002–2019 is studied. The dynamics of statistical indicators for 18 years is given using the methodology for calculating rank values. The dependence of the incidence of tuberculosis on the population density in the constituent entities of the country, the Far Eastern Federal District and its regions has been determined

scholarly journals Aplikasi Pupuk Urea pada Pertumbuhan Bibit Jabon Merah (Anthocephalus macrophyllus (Roxb.) Havil) di Persemaian (Studi Kasus di IUPHHK PT.Telagabakti Persada Halmahera Selatan)

2019 ◽  
Vol 10 (2) ◽  
pp. 70-74
Author(s):  
Laswi Irmayanti ◽  
Nurmaya Talib ◽  
Salam Salam
Keyword(s):  
Fertilizer Application ◽  
Fertilizer Treatment ◽  
Urea Fertilizer ◽  
Fast Growing ◽  
Fast Growing Species

Red Jabon (Anthocephalus macrophyllus (Roxb.) Havil.) is one of the fast growing species that became priority to be developed in South Halmahera Regency, North Maluku Province. Currently the red jabon has become “Local Superior Crops” in North Maluku. One of IUPHHK in South Halmahera which develops red jabon is PT. Telagabakti Persada. The purpose of this study was to determine the best growth of red jabon seedling on urea fertilizer application. The study was conducted at PT. Telagabakti Persada, South Halmahera. The treatments of urea fertilizer were 0 g,  0.25 g, 0.50 g, 0.75 g, and 1 g. The results showed that the urea 0.25 g  fertilizer treatment resulted in the best growth of red jabon seedlings.Key words: Red Jabon, Nursery, Growth of seedling, Urea

scholarly journals Quality of potatoes grown in various regions of Serbia as influenced by heavy metal and pesticide residues concentrations

2002 ◽  
Vol 47 (2) ◽  
pp. 161-177 ◽  
Author(s):  
Milos Rajkovic ◽  
Lidija Peric ◽  
Divna Kovacevic
Keyword(s):  
Heavy Metal ◽  
Ph Value ◽  
Starch Content ◽  
Potato Production ◽  
Fertilizer Application ◽  
Raw Material ◽  
Current Season ◽  
Metal Contents ◽  
Chemical Procedure

It is possible to decompose starch into monosaccharides by the method of acid starch hydrolysis. By applying appropriate chemical procedure, a main solution is obtained, from which aliquots are taken after filtration to determine of the present glucose according to Luff-Shoorlu method. The analysed potatoes of cv. Desiree, grown on various sites in Serbia, have starch content that corresponds to available literature data. The highest starch content is found in potatoes from Ivanjica and Novi Pazar, i.e. from the areas where climate factors, air temperature, and land relief are favourable for potato growing. Lower starch contents are found in potatoes grown in flat areas with warmer climate and drier periods. Those are sites in PKB-Belgrade, Smederevo, Dobanovci and Mrcajevci areas, where the values obtained by experimental procedure are very similar. The lowest starch content is found in potatoes from Belegis and Guca sites, where starch content is lower than normal from literature values, which may be explained by some special causes (climate, location, irrigation). On the basis of heavy metal contents in potato samples, it may be concluded that potatoes originating from sites famous for potato production are contaminated with Cd the content of which exceeds concentrations permitted by regulations. The presence of Cd in potato samples may also be explained by the application of phosphate fertilizers in higher (or recommended) rates. However, the soil itself should also be investigated, especially concerning the content of Cd and pH value. Thus, the influence of the soil itself should be established compared to fertilizer application in the current season. Presence of Cd in potatoes, on the other hand, is highly unfavourable because it prevents its utilization in nutrition, but also as a raw material for further processing of products based on potatoes: chips, etc. Also, Cd presence in foods is strictly controlled by EU, which prevents possible export of products based on potatoes containing Cd. Analyses of lindane and bensultap (Bancol) pesticides indicate that they are not within critical values, nor in such quantities to affect human health, so, from this aspect, the analysed potato samples from all sites are absolutely suitable for consumation.

scholarly journals Regional quality of living in Europe

REGION ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 1 ◽  
Author(s):  
Piet Lagas ◽  
Frank Van Dongen ◽  
Frank Van Rijn ◽  
Hans Visser
Keyword(s):  
Population Density ◽  
Capital City ◽  
Gdp Per Capita ◽  
European Regions ◽  
Policy Makers ◽  
The North ◽  
City Regions ◽  
Quality Of Living ◽  
Per Capita

This article sets out the conceptual framework and results of Regional Quality of Living indicators that were developed in order to benchmark European NUTS2 regions. Nine non-business-related indicators are constructed to support the goal of policy makers to improve the attractiveness of regions and cities for people or companies to settle in, and by doing so create economic growth. Each of the constructed indicators represents a pillar of the Quality of Living. The highest indicator scores are found for regions within Switzerland, Sweden, Norway and the Netherlands. Some countries show a wide divergence between regional scores. The southern regions of Italy and Spain, for example, have significantly lower scores than those in the north. In addition, capital city regions have better RQI scores. A positive correlation was found between the average RQI scores and both GDP per capita and weighted population density. Compared to GDP per capita, weighted population density has a modest influence on the RQI score. The European regions are divided into 11 clusters, based upon GDP per capita and weighted population density in order to benchmark a region with its peers.

scholarly journals The effect of osmocote fertilizers on growth and nutrient status of Carex buchananii Berggr.

2015 ◽  
Vol 68 (1) ◽  
pp. 75-80
Author(s):  
Monika Henschke ◽  
Ewelina Wojciechowska ◽  
Agnieszka Błaszyk ◽  
Katarzyna Araszkiewicz
Keyword(s):  
Nutrient Status ◽  
Fertilizer Application ◽  
Growing Up ◽  
Fresh Weight ◽  
Application Rates

An experiment on the effect of Osmocote fertilizers on growth and nutrient status of <em>Carex buchananii</em> was conducted in the years 2008–2009. <em>Carex buchananii</em> is a dense-tufted sedge growing up to 60 cm in height, with very narrow, stiff, red, copper and olive colored leaves throughout the season. Plants were grown in a greenhouse in pots with peat substrate for 18 weeks. The differentiating factors included the type of fertilizer, i.e. Exact Standard 16:11:11 and Osmocote Exact High Start 11:11:19, and fertilizer application rates of 2 and 4 g dm<sup>−3</sup>, the phase of growth, i.e. 1 to 9 weeks and 9 to 18 weeks of culture. The greatest increment in the tuft circumference of <em>C. buchananii</em> was recorded in the first 9 weeks of culture, while that of the fresh weight of aboveground parts – in the period from 9 to 18 weeks. The application of Osmocote Exact High Start at 4 g dm<sup>−3</sup> in the culture of <em>C. buchananii</em> resulted in the production of the desired quality of the plants with a greater tuft circumference and shorter leaves. It was shown that best quality plants contained in their aboveground parts the following amounts of macronutrients and sodium (g kg<sup>−1</sup>): N – 18.9, P – 3.5, K – 37.2, Ca – 5.8, Mg – 3.0, and Na – 0.3.

scholarly journals Non-Economic Quality of Life and Population Density in South Africa

2016 ◽  
Vol 134 (3) ◽  
pp. 1051-1075 ◽  
Author(s):  
Talita Greyling ◽  
Stephanié Rossouw
Keyword(s):  
Quality Of Life ◽  
South Africa ◽  
Population Density
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