Effect of nitrogen fertilization and organic acids on grains productivity and biochemical contents of quinoa plant grown under soil conditions of Ras Sader Sinai

الملخص EN

Afield experiment was carried out at Ras Suder Research Station (located at 29º 32' 28" N and 32º 39' 25'' E) throughout two seasons, i.e., 2014 and 2015 (saline soil of 8.56 dS m-1, soil paste extract) and irrigated with water of 7.94 dS m-1 on quinoa (Chenopodium quinoa, cv.

Utosaya) using organic manure, mineral N-fertilization and foliar spry with humic and ascorbic acids.

Growth, yield and nutrient uptake parameters increased with increasing N fertilizer, application of humic acid and spraying with ascorbic acid.

Treatments with organic manure gave yield values greater than without manure by 9.0, 7.3, 8.9 and 9.4% for plant height, number of branches per plant, 1000-seed weight per plant and total seed yield.

The combination of 48 mg organic manure ha-1 + 240 kg N ha-1 with spraying with humic acid solution of 600 mg L-1 + ascorbic acid solution of 1000 mg L-1 gave the highest positive response of plant height (cm) of 118, 26.4, 3.97 and 16.8 for plant height, number of branches per plant, 1000- seed weight, seed weight per plant and seed yield, respectively.

The highest values were obtained for 1000-seed weight, yield and nutrient uptake.

Treatments in relative comparison of the three highest treatment combinations are manure/148 kg N/ humic acid 300 mg L-1 /ascorbic acid 500 mg L-1 < manure/240 kg N/ humic acid 600 mg L-1 /ascorbic acid 1000 mg L-1.