جستجوی مقالات مرتبط با کلیدواژه "fertilization" در نشریات گروه "منابع طبیعی"

The aim of this study was to determine the response of saffron (Crocus sativus L.) to nutrient resources and maternal corm weights.

The experiment was conducted as a split-plot based on a randomized complete block design with three replications. The main plots included four integrated nutrition programs (NP0: control (without fertilization); NP1: cow manure, amino acids, humic acid; NP2: slaughterhouse waste, mono-potassium phosphate, humic acid, mix (macro-micro) fertilizer; and NP3: poultry manure, ammonium nitrate, humic acid, amino acid, hormone biofertilizer, NP fertilizer, micronutrients) and the subplots included three maternal corm weights (CW1: 4-8, CW2: 8-12, and CW3: 12-16 g).

The difference between the experimental treatments in terms of the effect on the studied traits of saffron was more significant in the second year than in the first year of the experiment. The NP3 treatment resulted in the highest values of the flower number (85.6), fresh and dry flower yield (28.21 and 5.48 g m-2, respectively), and fresh and dry stigma yield (3.35 and 0.67 g m-2, respectively). Also, planting the heaviest corms led to the highest values of the mentioned traits (79.9, 24.57, 4.85, 2.90, and 0.58 g m-2, respectively). The highest value of corm number (312.1), corm diameter (4.27 cm), corm weight (6.86 g), and corm yield (1562.4 g m-2) belonged to the NP3 treatment. The CW3 treatment obtained the highest values of the mentioned traits (322.7, 3.72 cm, 6.87 g, and 1476.5 g m-2, respectively). Furthermore, the highest dry stigma water productivity (1.942 g m-3) and corm water productivity (4.45 kg m-3) were found under the NP3 treatment. Also, the highest value of the mentioned traits (1.681 g m-3 and 4.18 kg m-3, respectively) was recorded in the CW3 treatment.

Research limitations: 

No limitations were identified.

Originality/Value:

 The results of this research clearly show the profound importance of the characteristics of the maternal corms and the integrated nutrition in changes in saffron yield. Overall, we conclude that the NP3CW3 treatment is the best treatment for obtaining the highest values of saffron flower and corm indices as well as the stigma and corm water productivity.

Boron deficiency can be a limiting factor for the flowering and fruit production of olive orchards. The appropriate time for foliar spray needs to be found in each environment. Research

Effect of foliar spray (350 mg L-1 from boric acid) after fruit harvest (Stage 1), during flower bud differentiation (Stage 2), and the anthesis (Stage 3) alone or in combination, on fruit set percentage, leaf and inflorescence boron, zinc, and iron concentration, soluble carbohydrates content in leaves of three commercial olive cultivars was investigated.

Results showed, the maximum fruit set percentage, the highest leaf and inflorescence boron content, was found in the Koroneiki cultivar when boron sprayed two times at stages 1+3 and stages 2+3. The highest leaf and inflorescence zinc content was found when boron sprayed two times at stages 2+3 on the Koroneiki cultivar. The highest leaf and inflorescence iron content was found in Baladi and Mission cultivars, respectively, when sprayed at stage 2 or two times at stages 1+3. Olive cultivar Baladi showed the highest leaf fructose, sucrose, and glucose content when boron sprayed at stage 2 alone or three times at stages 1+2+3. Research limitations: It can be useful to study different concentrations of foliar spray and other cultivars.

The response of different olive cultivars was not the same. It seems that boron spray at the appropriate time increased fruit set percentage, especially in Koroneiki. Therefore, more research is needed to find the best fertilization program in olive orchards of Golestan province.