Influence of mineral and organic artificial substrates on productivity of covered ground tomato under additional lighting

The article presents the results of studying the reaction of tomato plants to an artificial substrate on which they are grown with all other things being equal — lighting, nutrition, temperature, and etc. Among the studied parameters, the plants reacted to the greatest extent with an average daily growth, filling of fruits, which mainly influenced the yield of tomatoes.

Assessment of Corbicula moltkiana Growth by Different Methods on Variation of Substrates in Lake Maninjau, West Sumatera, Indonesia

Corbicula moltkiana is a mussel species in Lake Maninjau and one of the targeted fisheries resources in the lake. This study aimed to determine the feasibility of a controlled growth experiment of mollusk biota in describing their natural growth. The assessment was carried out in areas with different habitats in shore lake, namely sand and gravel-stone substrates. A consecutive 12 month- sampling was carried out from June 2013 to May 2104 using a Surber sampler at a 1-3 m depth were used to assess the wild population growth. Moreover, the growth of the controlled population was observed by rearing various sizes of mussels in artificial substrate namely three small baskets which installed in the shore area with 1-3 m depth at each station for four months. Monthly sampling was carried out to measure the shell length. The growth of C. moltkiana on wild population by VBGF methods show that at the gravel-stone substrate was higher, but the growth a controlled population in artificial substrate seemed in the sand substrate was higher than that in the gravel-stone substrate. The growth of aquatic biota in a controlled system (especially C. moltkiana) does not always reflect similar conditions to their wild growth.

Определение устойчивости картофеля к бурой бактериальной гнили в лабораторных условиях

The resistance (sensibility) study of potato plant’s aboveground part to brown rot causative agent conducted in laboratory conditions. The used technique for infecting plants growing on artificial substrate allowed to standardize experiment conducting and to decrease the hazard of pathogen spread. The re-ceived data in such way may use in breeding for the search of resistant parents forms to disease.

Effects of artificial substrates on the growth and immunology of postlarvae of Marsupenaeus japonicus (Spence Bate, 1888) (Decapoda: Dendrobranchiata: Penaeidae) reared in biofloc

We investigated the effects of biofloc and artificial substrates (net and brush) on the growth and immunology of the postlarvae of Marsupenaeus japonicus (Spence Bate, 1888) reared for 30 days. The mRNA expressions of innate immune-related genes (prophenoloxidase, masquerade-like serine proteinase, and lysozyme) in the postlarvae were analyzed using quantitative reverse transcription PCR (qRT-PCR). The highest specific growth rate of larvae (3.66 ± 0.02% d–1, 3.75 ± 0.02% d–1) were shown in the net and control groups. The highest survival rate (90 ± 7.1%) was observed in the brush group (P < 0.05). The net yield was significantly higher in the artificial substrate groups (brush 36.60 ± 6.19 g m–2, net 36.46 ± 2.36 g m–2) than in the control (33.79 ± 0.16 g m–2) (P < 0.05). Total suspended, volatile suspended, and suspended solids were significantly lower in the brush group than in the other groups. The immune-related genes showed significantly higher expressions in the artificial substrate groups than in the control. These results support the benefits of artificial substrate in M. japonicus nursery culture to mitigate space competition and suppress cannibalism, with a positive effect on survival. The additional surface area provided by the biofloc, which the larvae can graze on, enhanced the expression of immune-related genes in individuals.

Effects of Carbohydrate and Artificial Substrate Integration on Growth Performance of Mudskipper (Pseudapocryptes elongatus)

The carbon and artificial substrate integration was applied in mudskipper (Pseudapocryptes elongatus) culture to evaluate its effect on growth and enzyme activity. Wild mudskipper fries (6.9–7.3 cm; 3.88–4.12 g) were obtained in the coastal area of the Mekong delta. Fish were reared in 1 m3 fiber glass tanks containing 600 L of 15 ‰ seawater for 60 days in outdoor conditions. Mud was added to the tank bottom around 15 cm to simulate the culture condition as would be found in an earthen pond. Molasses (38% Carbon) was added daily to the culture water based on TAN level to balance C/N to 10. The results showed that the survival was in the range of 80.6–85%, and no significance in term of survival was found when comparing treatments. The individual weight of fish was 11.93–14.11 g/ind in range, fish in the culture where carbon and both carbon and substrate addition had significantly better growth and productivity than fish in the culture where molasses and substrates were not applied. The results of this study demonstrate that the growth performance and production of mudskipper significantly increased when the biofloc and substrate integration was applied.

Assessment of the Possibility of Biological Recultivation Tail Deposits in the Yenisei North

The assessment of the possibility of creating a plant-soil cover on an artificially created seal-gravel drainage layer with a rocky bed (h=110¸150 cm), on the disturbed areas of the adjacent areas of tailings storage facilities. Research for 2017–2019 shows that when sowing recult-vants with sowing standards of 150–200 kg/ha and doses of fertilizer N60P60K60 and N120P60K60 on an artificial substrate it is possible to form meadow formations with a density of grass 10–12000 pc/m2 and average productivity of 21–24 c/ha. A plant-soil-blooded blood with a turf layer of 8–10 cm is created with the simultaneous overlap of heavy metals of man-made substrates and elimination of pulp sands dusting, which contributes to the improvement of the microclimate of the environment.