Two field experiments were carried out during winter season (2016/2017) and summer season (2017) an clay soil to evaluate the effects of N management practices with irrigation on wheat and maize crop, nitrogen fertilizers were added before or after irrigation as a three sources of N (urea, ammonium nitrate and ammonium sulfate) on vegetative growth, production of yields, NPK content in grains of both wheat and maize as well as nitrogen recovery. The treatments included four doses from recommended dose ( 0, 60, 80 and 100 %). The N was splitted into three doses (50% at sowing + 25% at maximum tillering + 25% at spike initiation) for wheat crop. wterever, the N was applied at four splits dose ( at third leaf stage, ninth leaf stage, tasseling and milking stage) for maize crop. Results of indicated that, application of nitrogen at high er doses after irrigation led to increasing vegetation growth of both wheat and maize plants. Also, the same treatment produced the highest values of straw, grain yields, biological yield and harvest index of both wheat and maize compared to the other treatments. Macronutrients (N,P and K) uptake, and this addition of nitrogen fertilizers at high dose produced the highest values of macronutrients uptake by both grains of wheat and maize compared to the other treatments. Generally, nitrogen application after irrigation resulted in the highest values of nitrogen recovery compared with the nitrogen application before irrigation. Hence, it could be concluded that the best results were obtained when nitrogen applied after irrigation with both wheat and maize crops.
A field experiment was carried out in the in winter season of 2015/2016 at sandy soil in El-Sadat city, El Minufia Governorate, 30.3594° N, 30.5327° E, Egypt to evaluate the effect of phosphorus fertilization and potassium humate on the growth and yields of faba bean as well as its content of N, P and K. The experiment factors were phosphorus application at three different levels (0, 10, 15 and 30 P2O5 kg kg Fed -1 ) and potassium humate at rate of 0, 5 and 10 kg fed -1 . Also, the phosphorus use efficiency evaluated. The obtained results could be summarized as follows: Growth and yield parameters (plant height, No. of branches, No. of pods plant No. of seed pods) were significantly increased by increasing by increasing rates of added P potassium humate individually and in combination, where the highest values were resulted from their combined treatments especially at high application rates. The combination between phosphorus at 30 kg P2O5 fed -1 and potassium humate at rate of 10 kg fed -1 recorded the highest growth and production as well as minerals composition (N, P and K) content compared to the other treatments. On the other hand, potassium humate at high level combined with super phosphate recorded increased in the availability of nitrogen, phosphors and potassium. Concerning, the P-efficiency the results showed that, both agronomic efficiency and apparent recovery efficiency were recorded by the highest values when compared the P fertilizer alone.
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