Open Access Short Research Article

Effects of Rainfall Seasonal Dynamics on the Chemical Properties of the Soil of a Tropical Southern Humid Rainforest Ecosystem in Nigeria

M. R. Olojugba

International Journal of Plant & Soil Science, Page 1-11
DOI: 10.9734/IJPSS/2018/17122

Rainfall season changes in Nigeria affect soil chemical properties in tropical rain forest, the effect of rainfall variation on soil chemical properties depend on its intensity, duration and time. However, the report on the seasonal variation/changes in rainfall remained sketchy especially for the rainforest zone in Nigeria. Due to this, in the Southern humid rainforest in southwestern, Nigeria, assessment of seasonal changes on soil chemical properties was done. The study was done in Ala Forest Reserve in Ondo State of Nigeria in 2010, 2011 and 2012. Twenty randomly selected sampling plots were chosen at different seasons viz: January (considered as dry season), March (onset of rainy season), June-July and September (peak of rainy season) and November (waning of rainy season).  At five selected locations, random sampling was done at the depth of: 0 – 5 cm, 5 – 10 cm, 10 – 15 cm and 15 – 20 cm. Soil organic matter, soil pH, available phosphorus, total nitrogen and exchangeable cations (Ca, Mg and K), increased during the peak of rainy season. Soil nitrogen, organic matter and cation exchange capacity (CEC) decreased down the profile depths. Dry season (January) and peak of rainy season (June/July and September) showed greater influence on soil chemical properties.  Phosphorus content was maximum in dry season (January) and at the onset of rainy season (March). However, it remained lower at the peak of the rainy season (June-July and September). On the other hand, soil organic matter and total nitrogen were found to be low in dry season (January) as result of   burning of the vegetation.  At the peak of rainy season (July and September), nitrogen content increased as a result of nitrogen fixation activities. Also, the decrease in the total exchangeable bases (TEB) at the depths (10-20 cm) might be attributed to their involvement in the tissue synthesis and stem elongation at this active growth period

Open Access Original Research Article

Pot growing Media Amendment with Calcium Cyanamide and Weed Control Relationships

M. Leytur, A. C. Duarte Vera, A. Sala, B. Giardina, A. Di Benedetto

International Journal of Plant & Soil Science, Page 1-12
DOI: 10.9734/IJPSS/2018/42425

The aim of this research was to characterize the effect of a pre-transplant calcium cyanamide fertilization on weed control in the potted bedding ornamental plant Impatiens wallerana and to describe the physiological mechanisms involved. The positive effect of a calcium cyanamide amendment included both ammonium toxicity on weed seed germination and a decrease of weed rates growth such as relative leaf expansion rate (RLAE) and relative growth rate (RGR). Data showed RGR-NAR (net assimilation rate), RLAE-RGR, RLAE-NAR and RGR-root dry weight relationships, which would explain ammonium toxicity to roots and weed growth responses. These effects probably could be explained by a change in hormonal root synthesis. Our results showed that a pre-transplant calcium cyanamide amendment combining with a transplant routine optimize both I. wallerana growth and weed control.

Open Access Original Research Article

Investigating Yield, Yield Components and Some Qualitative Traits of Bulb in Iranian Improved Onion (Allium cepa L.) Red Rey Cultivar

Sayyedeh Mahsan Taghi Shokrgozar, Mohsen Khodadadi, Vahid Abdossi, Vahid Zarrin Nia, Ramin Hajianfar

International Journal of Plant & Soil Science, Page 1-8
DOI: 10.9734/IJPSS/2018/42000

The purpose of this two years research (2016-2017) conducted in Karaj is to investigate quantitative and qualitative traits of bulb in Red Rey Iranian improved onion ((Allium cepa L.) population Red Azarshahr as check in terms of increasing yield of bulb and qualitative traits especially in DM percentage. The improved population was achieved by the selection of superior bulbs, cultivation and its selfing and consequently the identification of the best families and conduction of open pollination between them. In April 2016, the improved population with basic population and Red Azarshahr improved cultivar (as a comparative cultivar as check) were evaluated in RCBD design at three replicate and the different traits were measured including total yield, bulb weight, bulb diameter, bulb height, number of bulb layers, the number of bulb centers, bulb firmness, dry matter of bulb, total sulfur content, total phosphorus content, total potassium content in bulb and the amount of bulb vitamin C. The results showed that the improved population was than basic population in various traits especially in bulb yield with 98.9 tons per hectare, but there was no superiority in improved population in proportion to basic population or check cultivar in qualitative traits of bulb particularly qualitative laboratorial characteristic (sulfur, phosphorus, potassium and vitamin C) except for dry matter percent and bulb firmness.

Open Access Original Research Article

Influence of Growth Retardants on Growth of Potted Alstroemeria (Alstroemeria hybrida L.)

Raiz Ahmed Lone, Imtiyaz Tahir Nazki, Nelofar ., F. A. Khan, Javeed Ahmad, Imran Khan, Gazanfar Gani, Muneeb Ahmad Wani

International Journal of Plant & Soil Science, Page 1-6
DOI: 10.9734/IJPSS/2018/42651

An experiment was conducted to evaluate the influence of different concentrations of Alar (Diaminozide) and Ethephon (Ethrel) as spray applications on two cultivars of pot grown Alstroemeria to study their effect on different vegetative parameters under shaded conditions during two successive flushes in the year 2016 – 2017 at the Research farm of Division of Floriculture and Landscape Architecture, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar Campus Srinagar, in 2017.  Fourteen different treatments with two cultivars (Pluto, New Pink) were used with four concentrations of Alar (0, 500, 1000 and 1500ppm) and Ethephon (0, 1000, 1500, 2000 ppm) were replicated thrice in a Completely Randomized Design. The investigation revealed that with application of Alar at 1500 ppm maximum reduction of height and number of leaves was observed in both cultivars in successive flushes followed by Ethephon 2000 ppm and Alar at1000ppm. Plant spread, diameter of shoots and chlorophyll content increases by application of Alar at1500 ppm. Height reduction of (33.05% and 21.21%) was observed in cultivar New Pink and Pluto respectively

Open Access Original Research Article

Effect of Graded Levels of Nitrogen and Potassium on Growth, Nutrient Content and Uptake of Sweet Potato (Ipomoea batatas. L.) in Vertisols of Maharashtra

M. Pushpalatha, P. H. Vaidya, B. H. Sunil, P. B. Adsul

International Journal of Plant & Soil Science, Page 1-8
DOI: 10.9734/IJPSS/2018/42408

An investigation was carried out to assess nutrient content and uptake of sweet potato under application of nitrogen and potassium. Sweet potato is an important tuber crop which requires an efficient cropping management to ensure adequate nutrient content and uptake for growth and development of the crop. The experiment was conducted with four levels of nitrogen (0, 75, 100 and 125 kg/ha) and three levels of potassium (0, 75 and 100 kg/ha) in a factorial randomized complete block design with three replications and twelve treatments. The field Experiment was conducted in kharif season during the year 2015-2016 on fine texture Vertisols. Data was recorded on length of main vine, length of subsidiary vine, leaf area index and nutrient content and uptake. The results indicated clearly that main vine and subsidiary vine length, leaf area index and concentration of nutrients in leaf, stem and tubers of sweet potato were significantly higher at 125 kg of nitrogen from urea + 100 kg potassium ha-1 from muriate of potash treatment. In general, higher nitrogen, phosphorus and potassium content in tuber were found as compared to stem and leaf. The higher N, P, K and S content and uptake were recorded by application of 125 kg N and 100 kg K ha-1 in block soils of Marathwad region of Maharashtra