Two field experiments were conducted at El-Serw Agricultural Research Station (ARC), Damietta Governorate during 2006 and 2007 growing seasons to evaluate economically the effect of phosphorus fertilizer levels (0, 15, 30 and 45 kg P2O5/fed), potassium fertilizer levels (0, 24, 48 and 72 kg K2O/fed) and their combinations as independent variables on some quantity and quality characters of cotton variety Giza 86 as dependent variables. The quantity characters were cotton seed yield (kg/fed), seed yield (kg/fed), lint yield (kg/fed.) and oil yield (kg/fed) and the quality characters were seed index (g), boll weight (g), number of open bolls/plant and nutrient concentrations (N, P and K %). Simple correlation, simple regression and stepwise regression analysis were used to detect different relationships included. The results obtained could be summarized as follows: 1-Quantity characters: A-Simple correlation 1-Results of simple correlation analysis indicated that the highest significant positive correlation of 2-tailed at 0.01 level was found between phosphorus fertilization and each of cotton seed, seed, lint and oil yields with r-values of 0.964, 0.966, 0.961, 0.979, respectively. 2-Significancy at 0.01 level and a positive correlation were found between potassium fertilization and each of cotton seed, seed, lint and oil yields with r-values of 0.964, 0.960, 0.929 and 0.969, , respectively. 3-Significancy at 1% level and a positive correlation were found between phosphorus x potassium fertilization and each of cotton seed, seed, lint and oil yields with rvalues of 0.964, 0.606, 0.658 and 0.562, , respectively. 4-Also, the result of simple correlation analysis showed that the significant at 0.01 level and positive correlation was found between phosphorus and potassium as independent variables and cotton seed yield as dependent variable with r-values of 0.728 and 0.433, respectively. B-Simple regression analysis: 1-Result of simple regression analysis cleared that the relative contributions of (R-2) for P, K and PK fertilization as independent variables were accounted by 92%, 89% and 39% from the total variation of cotton seed yield as dependent variable successively, the relative fertilization contributions of (R-2) for P, K and PK fertilization were accounted by 93%, 91% and 35% from the total variation of seed yield , respectively, also the relative contributions of (R-2) for P, K and PK fertilization were accounted by 92%, 85% and 42% from the total variation of lint yield successively and the relative contributions of (R-2) for P, K and PK fertilization were accounted by 95%, 93% and 30% from the total variation of oil yield, respectively. Rahmou, A. A. et al. 7212 C-Stepwise regression analysis: Result of stepwise regression analysis revealed that the P fertilization was the highest factor contributing to the total variation of cotton seed yield with R 2 being 52.3%; on the other hand, the K fertilization was the second factor contributing to the total variation of cotton seed yield with R 2 being 19.7%. 11-Qu...
Laboratory, greenhouse and field experiments were preformed to evaluate the antifungal activity of cobalt sulphate, salicylic acid, ethephone, dipotassium phosphate, ascorbic acid and neem oil at three concentrations for each against Sclerotinia sclerotiorum growth and sclerotial formation on PDA (Potato Dextrose Agar) and to verify its positive efficacy as defence activators (elicitors) in chickpea seedling and plants against damping-off and white stem rot disease. Also, efficacy of the five elicitors and neem oil in improving some growth parameters, protein, nitrogen, potassium and phosphorus contents of seed was determined. 1-Neem oil (2.5, 5.0 or 7.5 ml L -1 ) and salicylic acid at higher concentration (7.5 mM) significantly reduced the fungal growth and number of sclerotial formation in vitro.Reduction was always increased by increasing concentration of neem oil. 2-Soaking seeds in each one of the five elicitors or the neem oil tested, except ethephone, decreased seedling damping-off pre-(in most cases) or postemergence and increased survivals. The most effective inducers, however, were cobalt sulphate (1 mg L -1 ), salicylic acid (7.5 mM), neem oil (5 ml L -1 ), dipotassium phosphate (5 mM) and ascorbic acid (10 mM). While, ethephone treatment was the least effective. In the field experiments, white stem rot disease incidence was significantly minimized with all tessted treatments tested in both seasons, except ethephone. The highest reduction in the disease incidence was recorded with neem oil, followed by dipotassium phosphate and cobalt sulphate. 3-Giza 2 cv. was the highest susceptible to infection under greenhouse and field conditions. While, Giza195 and Giza 531 cvs. were the least. 4-Results of the field experiments indicated that application of all treatments, except ethephone, resulted in a significant improve in crop parameters of chickpea cultivars compared with the untreated control. Dipotassium phosphate recorded the highest number of tillers, weight of seed yield per plant, number of capsules per plant, and seed yield / feddan. 5-Giza 1 cultivar had the higher value of seed yield/fed. In the 1 st season, whereas Giza195 cultivar in the 2 nd season. 6-Giza 195 seeds had the higher crude protein content in the 1 st season, while Giza 531 showed the higher protein content in the 2 nd season. 7-Giza1 seeds had the higher content in phosphorus and potassium in the two seasons. 8-Ethephone exhibited the highest reduction in plant height, 100-seed weight, seed yield per feddan and N,P and K content in seeds.. 9-Dipotassium phosphate and neem oil treatments were superior than the other in increasing values of seed yield/fed., nitrogen, protein, phosphorus, potassium contents in Giza1, and Giza 195 cvs., while the lowest of them was detected in Giza2.
Micronutrients foliar application is much better than soil application to avoid not only nutrients fixation in the soil, but also leaching during irrigation. Two field experiments were carried out at El-Gimmiza Agricultural Research Station during the two successive growing seasons of 2005/2006 and 2006/2007 to study the effect of foliar application of the micronutrients (Fe, Mn, Zn and Cu) in a mixture on yield, yield components and seed chemical composition of lentil plant (lens Culinaris. Medic). The foliar treatments applied were: T1 ( 0.0 micronutrients), T2 (0.5 g/L micronutrients), T3 (1.0 g/L micronutrients) and T4 (2 g/L micronutrients).The obtained results revealed that spraying micronutrients at rate 0.5 g/L (T2) increased yield and yield components such as: plant height (3.1%), number of branches (7.8%), number of pods/plant (15.9%), seed yield/plant (30.8%), 1000-seed weight (9.4%) and seed yield (10.2%) as well as seed contents of protein (9%), K (31.1%), Fe (21.4%), Zn (12.3%), Cu (8%) and Mn (13.6%) compared with the control (T1 ). The application of micronutrients at rate 0.5 g/L (T2) caused significant increase in yield and yield components compared with other treatments. Meanwhile T4 (2g/L) gave significant decreases in most studied traits compared to T2. Also, the highest values were recorded with variety of Giza 4 than Sina 1 in all treatments during the two growing seasons.
A water culture technique was carried out in Soil Science Department, Faculty of Agriculture, Menoufia university winter season 2015 to study boron and nitrogen requirements and their effect on barely plants grown in a complete nutrient solution containing N at levels of 0, 30, 60 and 90 mg L -1 and B at levels of 0, 2, 3, 6 and 9 mg L -1 . At 42 days age, plants were harvested, divided into roots and shoots, air and oven dried and weighed to obtain fresh and dry matter yield of shoots and roots. The dried plant materials were analyzed for its content of N, P, K and B. The obtained results showed that the best growth (high dry matter yield) of barley shoots was obtained at 60 mg L -1 N and 2 mg L -1 B. For roots, increasing B concentrations in the culture showed negative effect on root dry matter yield. Application of B increased markedly B uptake by shoots and roots. Also, application of N increased B uptake by shoots and roots and seemed to reduce the injurious effect of B. Moreover, uptake of nitrogen by shoots and roots increased progressively with increasing N levels and B concentration up to 2 mg L -1 . The results also indicated that, uptake of P and K tended to increase with increasing B concentration in the range of 2 to 3 mg L -1 . Further increase in B rates decreased the uptake of P and K by plant.
Two field experiments were conducted at Mallawy Agricultural Research Station, Agric. Res. Center, El-Minia Governorate in summer seasons of 2006 and 2007 consecutively to study the effect of soil and foliar application of superphosphate and potassium sulfate on maize yield and its attributes and contents of N, P and K nutrients in ear leaf and kernels. Results indicated that foliar application of superphosphate at 10% concentration was significantly better than all other foliar applications involved in the current investigation in respect to kernel yield, ear length and ear diameter in the first season of ( 2006). Foliar application of potassium sulfate at 5% concentration was better than any other foliar application used in this investigation for producing kernel and ear yields in the second season of ( 2007). Foliar application of both superphosphate and potassium sulfate at 10% concentration gave the highest significant increase in N content in ear leaf and kernels in the second season of ( 2007).
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