Print ISSN: 2077-5822

Online ISSN: 2618-1479

Keywords : urea


The Effect of Fertigation Urea and Organic Materials in Some of Growth Features and Calotropin in Leaves of Calotopis Procera

Hayyawi Wewa Attia; Sawsan kadhem kraidi

Al-Qadisiyah Journal For Agriculture Sciences, 2014, Volume 4, Issue 2, Pages 97-105
DOI: 10.33794/qjas.2014.97288

The experiment has been conducted by using pots contain 15 kg of slit sand soil collection from one located in Al- Diwania river, Al-Qadisiya Province. The soil contains 750 sand, 200 silt and 50gm.kg-1 clay, bulk density 1.1 Mg m-3, Ec 2.7 ds.m-1 and pH7.1 , the available N,PandK15,10 and130 mg.kg soil-1 to study the effect of fertigation of urea and organic materials on some growth features and concentration of N,P and K % and calotropin µ.gm-1 in leaves of calotropis procera .
The experiment includes fertigation of urea ,organic materials, and mixed (urea+ organic materials) and the control. with 15 ton. ha-1 of organic fertilizer (Orgno Fert) as design (CRD). After 180 days from germination. The growth features, height of plant, diameter of stem, number of leaves. number of teller and concentration of N,P and K % and calotropin µ.gm-1 in leaves were estimated. LSD show superiority of mixed fertigation (dual) treatment for both practice followed by organic materials and urea respectively are compared with the control. Are increase with percentage of mixed fertigation (75.43, 56.62,58,97,39.94,14.29,38.88 and 37.59) % for height of plant, diameter of stem, number of leaves , number of tellers and concentration of N,P and calotropin in leaves respectively.

The Effect Urea on Nitrification Process in Some Soils of South of Iraq

Mohammed Saeed Haran

Al-Qadisiyah Journal For Agriculture Sciences, 2014, Volume 4, Issue 2, Pages 106-115
DOI: 10.33794/qjas.2014.97291

The objective of this experiment is to study the effect of different concentrations of urea-N on the amount of the available ammonium remained and that of nitrate formed so that to calculate the nitrification rates directly in the soil. Five concentrations of urea-N (0,75,150,225,300) ppm urea-N are used in a CRD factorial experiment with three replicates. Each treated soil is moistened to 90% of it’s field capacity and incubated at room temperature for forty days started during which the amount of nitrate formed was measured at a 10-day intervals water is added to maintain the moisture by weighing the plates every two days.
The following results are recorded:-
1-The results show that was ( 39.8%) of the added nitrogen for the soil taken from Karna, followed by Souq Al-Shiyokh (29.6%), and less than that is registered for the soils taken from Hay and Rafiaee (24.2% and 23.7%) respectively , which is then decreased in the following periods of incubation.
2-Generally the rates of nitrification in soil are proportional to the calcium carbonate and organic matter contents of the soil.

The Effect of Addition Urea and Ensiling Period on The Quality and Chemical Composition of Wheat Straw Silages

Ali A. Saeed

Al-Qadisiyah Journal For Agriculture Sciences, 2012, Volume 2, Issue 2, Pages 1-14
DOI: 10.33794/qjas.2012.68150

An in vitro experiment is conducted to study the effect of adding urea (0, 1.5
and 3% on dry matter, DM basis) and period of ensiling (15, 30, 45 and 60 days)
on the quality and chemical composition of wheat straw (WS) silages. All
samples are treated with 10% of molasses.
Results have shown that the addition of urea at the lower rate alters the color of
silages from yellow to greenish yellow with the appearance of fermented fruit
odor in samples ensiled for 60 days, but doubling urea level alters the color to
dark yellow and brown as the ensiling period is proceeded with the appearance
of ammonia odor.
The estimated Fleig points decline due to increasing the level of urea, but the
proceeding of ensiling period increases these points. pH of silages are increased
(P<0.01) due to urea treatment but it decreases (P<0.01) due to proceeding of
ensiling period.
Regarding the compositional changes, results have shown that the addition of
urea decreases (P<0.01) crude fiber (CF) and nitrogen free extract (NFE)
contents, but it increases (P<0.01) crude protein (CP) content. Proceeding
ensiling period decreases (P<0.01) CF and increases CP (P<0.05) and NFE
(P<0.01). Generally , better results are accomplished at the lower level of urea
and 60 days of ensiling.