جستجوی مقالات مرتبط با کلیدواژه "کود فسفر" در نشریات گروه "زراعت"

Uptake and use efficiencies of phosphorus and some other nutrients affected by rate of phosphorus fertilizer and bio-fertilizers application. This experiment carried out to evaluate the effect of chemical and biological phosphorus fertilizers on the phosphorus uptake and use efficiency in rapeseed in a factorial based on a randomized complete block design with three replications at the research station of the Faculty of Agriculture, Yasouj University, in 2019. The first factor included zero, 25, 50, 75, 100, and 125 kg ha-1 of phosphorus and the second factor included phosphorus biofertilizer containing Pseudomonas and its non-use. Phosphorous increased the uptake of nitrogen, phosphorus, and potassium. The highest yield was obtained from 125 kg of phosphorus and phosphorus biofertilizer. With the consumption of 125 kg of phosphorus and biofertilizer, the highest phosphorus use efficiency and remobilization was achieved. The highest phosphorus harvest index was obtained from the applying 50 kg of phosphorus and no biofertilizer, and the highest phosphorus utilization efficiency was obtained from the applying 50 kg of phosphorus along with biofertilizer. Generally, using biofertilizer with phosphorus increased nutrients uptake and seed yield. In traits such as grain yield, grain and shoot phosphorus content, there was no significant difference between the application of 50 kg of phosphorus + bacteria with the application of higher levels of phosphorus fertilizer alone, therefore, biological fertilizer can be substituted a significant part of chemical phosphorus fertilizer.

One of the principles of sustainable agriculture is the implementation of conservation agriculture, which includes the three principles of minimum tillage, permanent soil cover with plant residues and crop rotation with the aim of reducing the negative effects of conventional agricultural activities. In fact, it is a solution to increase sustainable productivity along with preserving the environment.

To investigate the applications of mycorrhiza in no-till and minimum-till systems, an experiment was conducted on chickpea (Mansour cultivar) as a split plot based on a randomized complete blocks design with three replications in the research farm of the Dryland Agricultural Research Sub-Institute during 2020-2022 cropping seasons. Cultivation system no-till and minimum tillage were in the main plots and five treatments of mycorrhiza application, mycorrhiza + half of the recommended amount of phosphorus, mycorrhiza + full amount of recommended phosphorus, full amount of recommended phosphorus and control were as the sub-plots.

The results showed that the interaction between tillage and phosphorus fertilizer was significant on yield, yield components, harvest index and plant height. The highest grain yield, biological yield and straw yield were 552, 1022 and 470 kg per hectare, respectively and the number of pods per plant (14 pods), the number of seeds per plant (12 seeds) and the 100-grains weight (37 grams) were obtained under direct seeding and combined application of mycorrhiza and half of the recommended amount of phosphorus fertilizer at the time of planting. Grain yield had a positive and significant correlation with the number of pods per plant, the number of grains per pod, and the 100-kernel weight. In general, the results showed that in the no-till system and the application of mycorrhiza along with half of the recommended amount of phosphorus fertilizer, i.e. 15 kg per hectare, the grain yield, biological yield and yield components of chickpea had the highest average. It is very important to implement no-till cultivation by increasing beneficial soil microorganisms and maintaining soil moisture in drylands.

In order to evaluate the effect of different levels of drought stress and phosphorus fertilizer on some physiological traits and essential oil of sweet basil (Ocimum basilicum L.), a factorial experiment was carried out in completely randomized design in a greenhouse of College of Agriculture, University of Zabol, Iran in 2009. Studied factors were water deficit(drought) in 3 levels (100%, 80% and 60% field capacity) and 3 levels of phosphorus fertilizer (0, 50 and 100 kg per ha). The results showed the effect of water stress levels (p<0.01). Interactions between water stress and phosphorus fertilizer led to significant reduction (p<0.05) on leaf relative water content, but different value of phosphorus fertilizer did not cause significant difference in this trait. Percent of Shoot protein significantly affected by phosphorus fertilizer and water stress treatments protein percentage increased with increasing severity of water stress and its value was for control, mild and severe stress, equal to 1/15, 1/95 and 2/38 percent, respectively. Water stress have significant effect (p<0.01) on chlorophyll fluorescence. So that at the control, 80 and 60 percent field capacity chlorophyll fluorescence values was equal to 0/85, 0/74 and 0 /64, respectively. Amount of Chlorophyll (chlorophyll meter) in two stages 15 and 30 days after stress treatment on basil plants showed the lowest amount of chlorophyll was obtained in conditions of severe stress (60 percent field capacity) at 30 days after the water stress amount that it‘s be equal to 6/17. Totally it seems sweet basil at water deficit stress conditions, with high production of proline and carbohydrate execute drought tolerance mechanism, but this conditions lead to decrease of chlorophyll and increase of chlorophyll fluorescence.

This research was conducted on determination of better planting distance and better amount of nitrogen and phosphorus for hybrid rice (Bahar 1). Planting distance were used in this experiment, include 30×15, 30×20 and 30×25 cm as main factor. And also nitrogen fertilizer was used, include four levels, 65, 95, 125 and 155 k/ha and phosphorus fertilizer used include tow levels, 50 and 100 k/ha as two factors in split plot as split plot factorial design with three replications. This experiment was performance in experimental field of Guilan University in growing season 2008. Result indicate that, planting distance was affected significantly on yield, seed number in square meter, tiller in shrub and fertile tiller in plant. And also, nitrogen fertilizer was affected significantly on number of tiller in shrub, seed number in square meter, fill seed percentage, 1000-seed weight and fertile tiller number. The highest rate of yield, amount of 8.23 ton/ha was obtained from planting distance 30×15cm. The highest number of seed in square meter was obtained from planting distance 30×25cm. Generally, planting distance 30×15 plus application of 155 kg nitrogen per hectare plus application of 100 kg phosphorus is the best conditions for obtaining of high yield in Bahar 1.