In semi-arid area of Laizhou(Shandong province)

fifteen lesimeters were used to study solute movement and balance on Shandong coastal saline soil under mariculture wasterwater irrigation. There are five treatments in this experiment

i.e

CK(non-irrigated) and the treatments of leaching fraction(LF) being 0.1

0.2

0.3 and 0.4. The results showed that

total desolved salts (TDS) at root zone for the treatments of leaching fraction being 0.1

0.2

0.3 and 0.4 increased by 89.78

92.35

96.10 and 102.85 g

respectively

when irrigated two times during the key developing stages of Helianthus tuberosus L. Some were leached blow the root zone and leaching proficiency reached 17.3%

24.4%

31.1% and 36.8% respectively. After mariculture wastewater irrigation

nutrients such as nitrate

ammonium and reactive phosphorus

increased at root zone. Amounts of nutrients being retained at root zone were different due to the differences of the movement abilities among the three solutes. Nitrate was apt to leaching blow the root zone

however

ammonium and reactive phosphorus be retained. Additionally

heavy rain helped to leach the soluble salts out of the root zone

but the nutrients were also being leached.Therefore

we concluded using mariculture wastewater to irrigate salt-tolerant crop could increase soil nutrients

while the total desolved salts would not be excessively accumulated.