Effects of shading on the growth of the purple pakchoy (Brassica rapa var. Chinensis) in the urban ecosystem

Received: June 21st, 2022 ; Accepted: September 4th, 2022 ; Published: September 12th, 2022 ; Correspondence: [email protected] green spaces in urban area can be utilized in many ways. Recently, more of the open spaces have been cultivated for vegetable production, gradually shifted from aesthetical purpose to the need for fresh healthy foods. Urban vegetable farming can be conventionally practiced on a limited backyard. Our research was aimed to assess the effects of shading treatments on growth and yield of purple pakchoi (Brassica rapa var. chinensis). The research was arranged based on the randomized block design with 4 levels of shading treatment. The results showed that shading treatments at 0%, 45%, 55%, and 80% significantly affected morphological growth traits, including plant height, number of leaf, lengths of petiole, length of leaf midrib, width of leaf blade, canopy diameter, and leaf SPAD index, total leaf fresh and dry weights, total fresh and dry roots, and lengths of stem; but did not significantly affect the leaf thickness. In all affected traits, heavier shading inhibited growth, confirming that the purple pakchoi prefers full sunlight. The leaf of purple pakchoi reached its maximum size at less than 14 days counted from the first day of leaf blade was fully unfolded. Purple pakchoi can be harvested at 35 days after transplanting. The accurate leaf area estimation in purple pakchoi can be achieved by using LW as predictor and calculated using the power regression (R² = 0.9806)

Identifikasi Beberapa Aksesi Jarak Pagar (Jatropha Curcas L.) melalui Analisis RAPD dan Morfologi

The objective of this research was to study and cluster of Jatropha germplasm belonging to University of Sriwijaya. This research was conducted from September 2007 until July 2008. The research used 14 accessions of Jatropha taken from some regions in Indonesia, namely: Komering, Palembang, Yogyakarta, Indralaya, ATP2, Pontianak, Lahat, Pagaralam, Curup, Lampung, Medan Aceh Besar, Pidi and Gorontalo. Accessions of Jatropha curcas L. were planted at Agro Techno Park (ATP) Bakung village, Indralaya Utara district Ogan Ilir, South Sumatera using Randomized Complete Block Design. RAPD analysis using 20 primers was done at RGCI (Research Group on Crop Improvement), Bogor Agricultural University. Dendrogram based on RAPD analysis produced five groups that were: the first group was Komering, Lahat, Pidi, Indralaya, Aceh Besar, Pontianak and Curup. The second group was Palembang and ATP2. The third group was Pagaralam, Gorontalo, and Medan. Lampung was included in to fourth group. The fifth group was Yogyakarta. Dendrogram from morphological marker had also five groups. First group was: Komering, Indralaya, Pontianak. Lahat, and Pagaralam. Second group was: Palembang, Lampung, Pidi, Medan, and ATP2. Third group was: Curup. Fourth group was: Yogyakarta and Gorontalo. Fifth group was: Aceh Besar. The difference of member from each groups between dendrogram using RAPD and morphological markers indicated that the bands resulted from RAPD did not have relation with characters observed

Kerapatan dan Viabilitas Konidia Beauveria Bassiana dan Metarhizium Anisopliae pada Media In Vitro Ph Rendah

Conidial density and viability of Beauveria bassiana and Metarhizium anisopliae grown on the low-pH in vitro medium. Liquid bioinsecticide with active ingredient from conidial entomopathogenic fungus has major constraints, namely short shelf life due to declining conidial viability and density is caused by low pH in the bioinsecticide carrier. This experiment aimed to measure the loss of conidial viability and density of Beauveria bassiana and Metarhizium anisopliae isolates grown on in vitro medium with low pH. Entomopathogenic fungus isolates were used as much as 28 isolates grown on in vitro medium at low pH, namely pH 5, 4, 3, and 2. The results showed that the fungus isolate that had the highest conidial density on in vitro medium at pH 5 was found on isolates of B. bassiana with code BPcMs (2.583 x 109 conidia mL-1), while the lowest one was found on isolates of B. bassiana with code of BWS Pantura (0.825x109 conidia mL-1). All isolate conidial density from in vitro medium with pH 2 decreased regularly. Conidial density of BPcMs isolate decreased to 2.483 x 109conidia mL-1, as well as BWS Pantura isolate also decreased to 0.425x109 conidia mL-1. The highest conidial viability at pH 5 was found on isolates of B. bassiana with code of BPcMs (51.572%), while the lowest conidial viability was found on isolate of B. bassiana with BTmPc code (15.040%). At pH 2, almost isolates tested had low conidial viability. The conidial viability of isolates BPcMs decreased to 47.037%%, while the isolates BTmPc also decreased to 12.778%. Therefore, the lower of the pH of the in vitro medium was, the lower of conidial viability and density of B. bassiana and M. anisopliae wa

Proximity Dimensions and Scientific Collaboration among Academic Institutions in Europe: The Closer, the Better?

The main objective of this paper is to examine the effect of various proximity dimensions (geographical, cognitive, institutional, organizational, social and economic) on academic scientific collaborations (SC). The data to capture SC consists of a set of co-authored articles published between 2006 and 2010 by universities located in EU-15, indexed by the Science Citation Index (SCI Expanded) of the ISI Web of Science database. We link this data to institution-level information provided by the EUMIDA dataset. Our final sample consists of 240,495 co-authored articles from 690 European universities that featured in both datasets. Additionally, we also retrieved data on regional R&D funding from Eurostat. Based on the gravital equation, we estimate several econometrics models using aggregated data from all disciplines as well as separated data for Chemistry & Chemical Engineering, Life Sciences and Physics & Astronomy. Our results provide evidence on the substantial role of geographical, cognitive, institutional, social and economic distance in shaping scientific collaboration, while the effect of organizational proximity seems to be weaker. Some differences on the relevance of these factors arise at discipline level