جستجوی مقالات مرتبط با کلیدواژه « کودهای کندرها » در نشریات گروه « آب و خاک »

In recent years, carbon-based nanomaterials have been widely applied in agriculture due to their higher biocompatibility, cheapness, and important effects on the growth and production of plants. In this research work, a new fertilizer based on carbon nanomaterials (Zn-NCDs) was synthesized using citric acid, urea, and zinc chloride as the precursors via a one-pot simple hydrothermal method and characterized by FT-IR, CHN, EDS, DLS, PL, UV-Vis, FESEM, TEM, ICP-OES, and zeta potential. Then, the effects of the Zn-NCDs as a zinc source were evaluated on the growth and the improvement of zinc uptake in the shoot of wheat (Triticum aestivum, Sirvan) under a hydroponic condition using a completely randomized design, with three replications and three concentrations of 2, 4, and 8 mg L-1 compared to ZnSO4, and Zn-EDTA (with a concentration of 2 mg L-1). Instrumental analysis showed that Zn-NCDs nanocarriers have uniform dispersion, no apparent aggregation, and an average particle size of less than 5 nm. Also, the presence of carbon, nitrogen, oxygen, and zinc in the structure of Zn-NCDs was confirmed. The hydroponic culture revealed that Zn-NCDs was as effective as two commercial fertilizers, ZnSO4 and Zn-EDTA, in providing zinc in the shoot of wheat plants. Also, Zn-NCDs significantly increased the percentage of nitrogen and protein in shoot compared to ZnSO4. The results of the soil incubation demonstrated that the zinc release from NCDs nanocarrier continued for 30 days.

In order to achieve an effective approach to improve nitrogen use efficiency in rice, a field experiment was conducted based on randomized complete block design with three replications and 13 treatments on a local rice variety, namely, Hashemi, in Rice Research Institute of Iran (Amol) during 2015 and 2016. The treatments included: N0: no N, N1: split application of 55.2 kg ha-1 N from source of urea (recommended for Hashemi variety), (N2, N3), (N4, N5) and (N6, N7) application of 55.2 and 27.6 kg ha-1 N from SCU, USG and AS sources, respectively; N8: application of nitrogen  nanofertilizer; N9, N10 and N11: application of Azospirillium, Azotobacter, and Azospirillium + Azotobacter. In addition to the mentioned sources, in N8 to N11 treatments, 27.6 kg ha-1 N from urea was used. N12: Farmers’ fertilizer practice (Pre planting application of 55.2 kg ha-1 N from urea). Results of the experiment showed that the effect of treatments on the measured traits, except nitrogen content of straw, caused a significant (p<0.05) difference. The highest grain yield was obtained from N6 (4542 kg ha-1). The performance of N5 (deep placement of 27.6 kg ha-1 Nfrom source of USG) was not significantly different from the treatment with the highest grain yield (N6). The highest amount of PFP, AEN and REN was obtained from N5 treatment and the highest PEN and IEN[H1]  was obtained from N10. N5 increased grain yield by 4.6% and recovery efficiency by 59.4% in compared to N12. The highest amount of N uptake (119.5 kg ha-1) was obtained from N4 treatment. Based on the results, it could be concluded that the deep placement of USG fertilizer has relative advantage compared to other N supplying sources because of enhanced amount of N uptake and reduced N losses.



 [H1]Please define these symbols.