This research aims to determine growth and deficiency patterns as well as antioxidative potentials of Japanese mint (Mentha arvensis) hydroponically grown under limited macronutrients and micronutrients. The experiment was conducted for 60 days after transplanting in an evaporative greenhouse (avg temp = 28–30 °C, 60–65 %RH), using deep water culture technique. Plants were grown in nutrient solution consisting of complete Hoagland’s solution (CTRL), and nutrient solutions lacking one of the following macronutrients and micronutrients: nitrogen (-N), phosphorus (-P), potassium (-K), iron (-Fe), manganese (-Mn), and copper (-Cu). The deficiency symptoms, growth patterns, and stress response mechanism were followed. All treatments except for the CTRL induced deficiency symptoms and physiological changes. Macronutrient deprivation reduced growth determined by the morphological parameters while micronutrient omission had no effect except for no iron treatment. The result showed that potassium and iron deficiencies had foremost adversely effect on growth of Japanese mint. Under nutrient stress conditions, plant only gave antioxidative responses to phosphorus and potassium deficiencies. However, the negative plant-stress relationship was found for no iron treatment indicating the detoxification mode of plant for lacking of micronutrient.
Biologishe Bundesanstalt, Bundessortenamt and CHemical Industry (BBCH) scales are a system for the uniform coding of phenologically similar growth stages of plants, using a two-digit decimal code. This paper describes the phenological growth stages of a landscape tree, Xanthostemon chrysanthus using the BBCH-scale. Detailed descriptions of principal growth stages for bud, leaf and shoot development, inflorescence emergence, flowering, fruit development, maturity or ripening of fruit and seed, and other secondary growth stages are provided. The developed scale will be of great help to landscape managers and researchers for better communication, more efficient planning of management practices and experiments of flowering trees.
Paclobutrazol (PBZ)(0 g L-1, 0.125 g L-1, and 0.25 g L-1) and potassium nitrate (KNO3)(0 g tree-1, 100 g tree-1, and 200 g tree-1) were tested on a landscape tree, Xanthostemon chrysanthus (F. Muell.) Benth., in an attempt to enhance its stress tolerance under harsh urban conditions. Significant effects on tree height, diameter at breast height, canopy diameter, leaf area, and anatomy of tree leaves and stems in response to PBZ and KNO3 have been previously reported; in addition to these, the influences on leaf thickness and leaf physiology, including chlorophyll content and gas exchange, are discussed in this study. Relative chlorophyll content was significantly increased with PBZ and/or KNO3, enhancing leaf greenness. Increased leaf thickness of up to 13.37% at 6 months after treatment with a combination of PBZ and KNO3 was observed. The presence of PBZ significantly reduced the photosynthetic and transpiration rates and stomatal conductance. Reduced leaf physiological traits combined with thicker leaves would be beneficial for trees to tolerate harsh urban settings. Therefore, a combination of PBZ and KNO3 is recommended for stress tolerance enhancement of X. chrysanthus grown as a landscape tree.
The experiment was conducted with the main objective was to study the effects of Paclobutrazol (PBZ) on growth and antioxidant content of Brassica rapa var. oleifera. The PBZ was applied at various concentrations (0, 5, 10, 15 and 20 mg /L) through seed soaking and seedling as soil drenching. The growth performance data collection was conducted on weekly basis starting from week 3 until week 6 of planting while antioxidant content analyses were conducted on day 38. It was found that PBZ affected the growth and antioxidant content of Brassica rapa var. oleifera. The soil drenching techniques was found significantly affect the plant height, number of leaves and internode length. Similarly, both ascorbic acid and phenolic content were significantly affected by the technique. It was found that application of 10mg/L and 5mg/L of PBZ has recorded highest amount of ascorbic acid and phenolic content, respectively. This study has proven that the application of PBZ using soil drenching technique on Brassica rapa var. oleifera has contributed to enhancement of its antioxidant content which is also one of the important component in healthy diet intake.
Medicinal herb production has become more challenging nowadays as it is demanded, as far as possible, to avoid chemical fertilizers and other agrochemicals for higher quality of the produce. The present study was a split plot experiment conducted to examine the effect of shading and application of compost derived from dumped brassica vegetable-dumped or expired bread-fish gill and internal organ (3:2:1) wastes towards growth and yield of Andrographis paniculata grown in open field as alternative to conventional organic fertilizers in current market. Main plots were plots of full sunlight and 50% relative light intensity (RLI) as achieved by commercial 50% shade netting. Within each main plot, sub plots of treatments at 0 g compost + 5 g nitrophoska (NPK) green/plant, 0, 25, 50, 75 and 100 g compost/plant, respectively, were laid out at random. Fertilization was carried out only once throughout the production period of eight weeks. Each sub plot treatment was replicated four times, each with three plants per replicate. Results indicated that plant grown under full sunlight combined with application of 100 g compost/plant, or 3 tonnes compost/hectare at 30,000 plants/hectare, was the best, especially in production of leaves as its main economic plant part for the herbal industries. Such inorganic fertilizer free plants were better than the recommended inorganic 5 g NPK green /plant or at a rate of 150 kg/hectare fertilization in production of this medicinal plant.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.