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In order to reveal
the regulating capacity of organic fertilizers on sandy soil, pots
experiments were carried out. The growth of
tomatoes planted on sandy soil amended by organic fertilizers was measured.
Organic fertilizers can be helpful to improve the plant height, stem
diameter, the aerial parts fresh weight, root fresh weight, leaf photosynthetic
rates and photosynthesis, and lay a good foundation for the growth of tomatoes. The effect of organic
fertilizer is the most significant. Among all the treatments of adding
2.5%, 5%, 10% organic fertilizers, adding 10% organic fertilizers are the best.
It can significantly enhance the growth and photosynthesis of tomatoes, and
it is among the best of these three soil treatments for sandy soil.
The activity concentration of naturally occurring radionuclides 40K, 226Ra and 232Th have been measured in different brands of fertilizer samples in Saudi Arabia using sodium iodide gamma spectrometry. The results of measurements showed that the mean (ranges) of specific activities for 226Ra, 232Th and 40K activities in the nitrogen, phosphorus and potassium fertilizers are 64 (35.8 - 120.7), 17 (3.2 - 56.8) and 2453 (744.9 - 4227.1) Bq/kg, respectively. With respect to organic fertilizers under investigation, the average radioactivity of 226Ra, 232Th and 40K are 42, 10 and 333 BqKg