تأثير السماد البوتاسي و العضوي و الري الناقص في امتصاص بعض المغذيات و حاصل الذرة الصفراء (Zea Mays L)‎

الملخص EN

A field experiment was carried out at the Al suwaira Research Station of the Agricultural Research Directorate-Ministry of Agriculture in silty clay soil, to study the effect of potassium added to the soil and organic fertilizer and its relationship to the state of plant tolerance to different ranges of moisture stress by measuring the product and plant content of nutrients N, P and K.

Using deficit irrigation with three levels of potassium and organic fertilizers.

Levels of potassium fertilizer were 0, 100 and 200 kg k ha-1 symbolized as K0, K1, K2 respectively, and the amount of fertilizer added was divided during the stage of emergence, vegetative growth, and the beginning of flowering.

In addition to, three levels of organic fertilizer were (0, 1 and 2% ) symbolized as M0, M1, M2 respectively, organic fertilizer was added to the top layer of the soil while preparing the experiment plots.

Deficit Irrigation, T1 (regular irrigation according to crop water requirements when 50% of available water is depleted) and T2 (skip one irrigation during each of vegetative, and flowering stages), and T3 (skip one irrigation during each of initiation, vegetative, and flowering stages).

The experiment was conducted according to Randomized Complete Block Design (RCBD) with three replications.

Maize crop Var.

5018.

The results showed: The second level of potassium and organic fertilizers treatments (K2 and M2) achieved a significant increase in maize yield and other growth characters when treating regular irrigation T1 compared to the other treatments, these interaction also reflected role of K1 in reducing and M1the effect of the moisture stress of the treatment T3.

It was found that additions of potassium and organic fertilizers (K2 and M2) achieved the best levels of orption of nutrients of the plant (N, P, K( for both stages of growth, compared to the treatment of deficit irrigation T3.

It was also clear that the significant or ence of significant differences between treatment T3M2K2 and treatment T2M0K0 or treatment T1M0K0 during the vegetative growth and crop maturity stages which indicates the role of these fertilizer in reducing the impact of the treatment of high moisture stress (T3) during thesestage.