Current Issue : April - June Volume : 2019 Issue Number : 2 Articles : 5 Articles
There is a growing interest in using miniature multi-sensor technology to\nmonitor plant, soil, and environmental conditions in greenhouses and in field\nsettings. The objectives of this study were to build a small multi-channel\nsensing system with ability to measure visible and near infrared light reflectance,\nrelative humidity, and temperature, to test the light reflectance sensors\nfor measuring spectral characteristics of plant leaves and soilless media, and\nto compare results of the relative humidity and temperature sensors to identical\nmeasurement obtained from a greenhouse sensor. The sensing system\nwas built with off-the-shelf miniature multispectral spectrometers and relative\nhumidity and temperature sensors. The spectrometers were sensitive to\nvisible, red-edge, and near infrared light. The system was placed in a greenhouse\nsetting and used to obtain relative reflectance measurements of plant\nleaves and soilless media and to record temperature and relative humidity\nconditions in the greenhouse. The spectrometer data obtained from plant leaf\nand soilless media were compatible with baseline spectral data collected with\na hyperspectral spectroradiometer. The greenhouse was equipped with a relative\nhumidity and temperature sensor. The relative humidity and temperature\nsensor measurements from our sensor system were strongly correlated with\nthe relative humidity and temperature results obtained with the greenhouse\nsensors (i.e. , correlation coefficients > 0.70 or <--0.70), and the mean relative\nhumidity and temperature sensor values were similar for our system and the\ngreenhouse system. Overall, the proposed sensor showed good potential as a\ntool to measure spectral response patterns of plant and potting mix material\nand environmental conditions relevant to greenhouse research. The system\nwas inexpensive to build; the total cost of its components was 123 Dollars ....
Destructive effects of conventional insecticides on environment have created\na necessity to introduce bio-rational products in pest control programs. Effectiveness\nof bio-pesticide (Beauvaria bassiana ), natural oil (anti-insect), a\nbotanical extract (nimbecidine) and malathion insecticide was evaluated\nagainst Thrips spp. and Bemisia tabaci attacking tomato in Kafr El Sheik,\nEgypt. The trial was conducted during two successive seasons; 2017-18 in a\ntotal area of 4912 m2 cultivated with tomato cultivar zero 42. The experiment\nwas set up in a randomized complete block design with five replications for\neach treatment. Yellow sticky traps were used to monitor population of both\npests before and after spraying, in addition, their numbers on plants were\ncounted. Results revealed that highest control rates of both pests were recorded\nafter the fourth day of each spraying. Long inter-applications periods\ndecreased effectiveness and the greatest control resulted when three consecutive\nsprayings were applied. Malathion achieved the highest suppression of\nboth pests. Within the bio-rational pesticides, nimbecidine gave the greatest\nthrips control whereas products showed no significant difference for whiteflies.\nThe study recommends those bio-rational compounds to join Integrated\nPest Management programs of both pests in Egypt, taking into consideration\nspraying for 3 consecutive times with at least 5 days intervals....
In general, the conditions for the growth of vegetation in former mining\nworks are unfavorable, particularly in locations where the rooting process or\ninadequate functional contact by the root system with underground water,\ncreates vegetative problems. For the process of the revitalization of the disrupted\nareas to be successful, the correct rooting of woody plants is essential\nfor starting the development of the vegetation, and directing it towards greater\nbiodiversity. The addition of bio alginates, whose basic raw component is\nselected seaweed, to the soil ensures the stimulation of the root system, thereby\nsignificantly increasing the likelihood of the plants surviving. The article\nmonitors, in detail, the effect of the application of these bio alginates, and the\nsubsequent response of the plants in growth patterns....
Salt tolerance of segregating progenies of a cross between a domesticated salt\nsensitive tomato cultivar (CA4) and a natural salt-tolerant wild-type tomato\nspecies (LA1606) was characterized. The F1 plants from this cross were selfed\nand 120 F2 segregating progenies from the resulting population along with\nparental CA4 and LA1606 plants were evaluated for salt tolerance. These\nplants were irrigated everyday with 185 mM NaCl for 82 days and quantitative\ntraits were quantified including number of flowers, fruit number, fruit\nweight, fruit length, fruit width, fruit set percentage, and total yield. The two\nparental lines were evaluated for the presence of 27 seven independent RAPD\nmarkers and 7 markers were found to be polymorphic for the two genotypes.\nBulk Segregant (BSA) analyses consisting of pooling 10 â??most tolerantâ? and\n10 â??most sensitiveâ? F2 segregating plants showed association of two RAPD\npolymorphic markers with higher salt tolerance. Two DNA markers that exhibit\nco-segregation with salt tolerance were identified and characterized.\nRAPD marker OPX-17 and MRTOMR-022 exhibited 2 positive molecule\nmarkers (polymorphism) which were found only in the resistant parent\n(LA1606) and resistant F2 bulk....
Effective control strategies are lacking for Fusarium wilt of banana crops\nworldwide. Here, the inhibitory efficacy of suspensions derived from Tilapia\noffal by anaerobic fermentation against Fusarium oxysporum f. sp. cubense\ntropical race 4 (Foc TR4) was evaluated. Two anaerobic fermentation methods\nwere used: 1) natural fermentation of offal (NF) and 2) fermentation of\noffal supplemented with 5% lime (LF). The suspensions were applied in three\ntreatments: Plate assay, pot system, and in the field. The inhibition rate and\ndisease index were determined. The results showed that the inhibition was\nsignificantly greater for LF than for NF on plates. In pot system and in the\nfield, the disease index was lower for the LF group than for the NF group and\nwas significantly lower than that of the control. Therefore, suspensions derived\nfrom anaerobically fermented offal provide a new control method for\nFusarium wilt in banana....
Loading....