جستجوی مقالات مرتبط با کلیدواژه "وزن دانه" در نشریات گروه "اکولوژی"

This research aims to investigate the yield and yield components of safflower (Carthamus tinctorius) in intercropping with dragon head (Lallemantia iberica).

Mixed cropping was done based on increasing series, where Carthamus tinctorius is the main plant and Lallemantia iberica is the Sub plant. The basic design of the experiment was in the form of randomized complete blocks with four replications. Different cultivation patterns include pure Carthamus tinctorius cultivation, 100% Carthamus tinctorius with 15% Lallemantia iberica, 100% Carthamus tinctorius with 30% Lallemantia iberica, 100% Carthamus tinctorius cultivation with 45% Lallemantia iberica, 100% Carthamus tinctorius with 60%Lallemantia iberica, 100% Carthamus tinctorius with 75%Lallemantia iberica. In this study, Carthamus tinctorius traits included number of pods per plant, number of seeds per pod, weight of 1000 seeds, seed yield and biological yield.

The results showed that the effect of different cultivation patterns on the number of seeds per plant and seed weight was not significant, but it was significant on the number of pods per plant, seed yield and biological yield .The highest number of seeds according to the 100:30 mixed crop pattern (Lallemantia iberica- Carthamus tinctorius) and the highest seed yield and biological yield belonged to pure Carthamus tinctorius cultivation.The highest land equivalent ratio belonged to 100:30 mixed cultivation (Lallemantia iberica-Carthamus tinctorius).

100:30 intercropping pattern (Lallemantia iberica-Carthamus tinctorius) was suggested as the suitable pattern of mixed cropping due to highest grain yield, biological yield and economic benefit.

Proper tillage practices and cover crops planting are suitable methods for the development of sustainable agriculture which plays important role in sustainability of crop production systems. Therefore, in order to evaluate the effect of different tillage methods included conventional tillage, minimum tillage and non tillage and cover crops included Vicia villosa, Lathyrus sativus and non planting cover crops on corn yield and some soil characteristics, an experiment was carried out at the Researches Farm of Agricultural Faculty, Bu-Ali Sina university during growing season of 2010-11. Experiment was laid out as a factorial based on randomized complete block design with three replications. Results showed that number of seed row per ear and grain yield was affected by tillage treatment. Also, number of seed row per ear and grain and biological yield were affected significantly by cover crop. But, tillage × cover crop interaction was not significant. The highest values of number of seed row per ear and grain yield (1123 gm-2) was achieved at minimum tillage treatment. This treatment in comparison with conventional tillage treatment increased corn yield up to 20%. Maximum grain and biological yield were revealed at cover crops planting treatment and minimum grain and biological yield were achieved at non planting cover crops treatment. Effect of treatments on organic matter percentage and bulk density was significant. Maximum value of organic matter and minimum value of bulk density were revealed at cover crops planting and minimum tillage treatments. So, it seems that using minimum tillage and cover crops could increase corn yield and improve soil structure.

In order to evaluate the efficiency of plant growth promoting rhizobacteria (PGPR) plus nitrogen and phosphorous chemical fertilizers on relative agronomic efficiency of P and N fertilizers and some agronomic parameters of wheat (Triticum aestivum L.) cultivar N-80-19، an experiment was conducted at Sari Agricultural Sciences and Natural Resources University during growing season of 2008-2009. Experiment was arranged in split-split plot based on randomized complete block design with three levels (0، 25 and 50 kg. ha-1) and sub-plots were considered PGPR at four levels (control، inoculation with nitrogen fixing bacteria (PFB)، phosphate solubilizing bacteria (PSB) and dual inoculation with PFB and PSB) with three replications. Results showed that the application of biofertilizers significantly increased relative agronomic efficiency of N and P fertilizers، spike number، plant height، flag leaf area، grain yield and grain weight of wheat. Application of biofertilizers increased wheat grain yield as much as 46. 6% as compared to control. Double inoculation of biofertilizers improved relative agronomic efficiency of fertilizers by 58. 4 and 76. 5% as compared to control، respectively. Integrated treatments showed higher performance compared to separate treatments. Generally، biofertilizers with low levels of P and N fertilizers significantly improved yield components of wheat without any reduction in yield related parameters.