A Habibi; G.H. Heidari; Y. Sohrabi; Kh. Mohamadi
Abstract
In order to study the effect of biofertilizers and chemical fertilizers on yield, yield components, chlorophyll and photosynthesis rate of pumpkin (Cucurbita pepo L.), an experiment was conducted in a randomized complete blocks design with 8 treatments and 3 replications at Research Farm of Kurdistan ...
Read More
In order to study the effect of biofertilizers and chemical fertilizers on yield, yield components, chlorophyll and photosynthesis rate of pumpkin (Cucurbita pepo L.), an experiment was conducted in a randomized complete blocks design with 8 treatments and 3 replications at Research Farm of Kurdistan University in 2009. Treatments included: control (N1), nitroxin (free-living nitrogen fixing bacteria) (N2), phosphate solubilizing bacteria (N3), nitroxin + phosphate solubilizing bacteria (N4), chemical fertilizer (urea 120 kg ha-1 + mono super phosphate 150 kg ha-1) (N5), 50% chemical fertilizer + nitroxin (N6), 50% chemical fertilizer + phosphate solubilizing bacteria (N7), 50% chemical fertilizer + nitroxin + phosphate solubilizing bacteria (N8). Results indicated that the fertilizer treatments had significant effects on chlorophyll, photosynthesis rate, fruit diameter, fruit fresh weight and fruit and seed yield. Maximum seed yield (97.97 gr/m2) was obtained from (N8) treatment and the highest fruit yield (6272.2 and 5790/5 gr/ha), photosynthesis rate (15.56 and 14.05 µmol m-2 s-1 CO2) and chlorophyll (53.06 and 50.08 SPAD values) were obtained from (N8) and (N6) treatments respectively. The fertilizer treatments had no significant effects on the 1000 seed weight and number of fruits per stem. According to the results, it is concluded that application of biofertilizers along with 50% chemical fertilizer could reduce the need for chemical fertilizers and the highest seed and fruit yield would be obtained.
S. Rahimzadeh; Y. Sohrabi; Gh. Heidari; A.R. Eivazi; T. Hoseini
Abstract
In order to evaluate the effect of biofertilizers on the yield and quality of Dracocephalum moldavica L. essential oil, a field experiment was conducted at the Western Azarbaijan Agricultural Research Station in 2008. Randomized Complete Block Design was used including 9 treatments and 4 replications. ...
Read More
In order to evaluate the effect of biofertilizers on the yield and quality of Dracocephalum moldavica L. essential oil, a field experiment was conducted at the Western Azarbaijan Agricultural Research Station in 2008. Randomized Complete Block Design was used including 9 treatments and 4 replications. Treatments were nitroxin, biological phosphorus, bio-sulfur, nitroxin + biological phosphorus, biological phosphorus + biosulfur, nitroxin + biosulfur, nitroxin + biological phosphorus + bio-sulfur, chemical origin of nitrogen + phosphorus + potassium and control (no fertilizer treatment). According to the results, the effect of treatments on dry matter yield (leaves), seed and biological yield, percentage and yield of essential oil and thousand seed weight was significant (P<0.01) while it was not significant on harvest index of leaves and harvest index of seed. Means comparison showed that applying chemical fertilizer (NPK) resulted in highest leaves dry matter, seed and biological yield. The highest essential oil content and essential oil yield respectively obtained from nitroxin + biological phosphorus + bio-sulfur and nitroxin biofertilizer. Considering the fact that no significant difference was observed between applying nitroxin and chemical NPK, it can be concluded that applying nitroxin may result in maximum seed and essential oil yield. In all studied traits, application of some biofertilizers was significantly better than control treatment (no fertilizer).