The effect of zinc and boron interaction on residual available phosphorous and zinc in the soil after corn harvest
2007
Aref, F. (Islamic Azad Univ., Firouz Abad (Iran). Dept. of Soil Science)
For the purpose of studying the effect of Zn and B on the residual available P and Zn in the soil after corn harvest, afield trial was conducted in 2004 at Fars Neyriz region of Iran. Treatments including five levels of Zn (0, 15, 30 and 45 kg per ha and Zn foliar spray) and four levels of B (0, 4 and 8 kg per ha and B foliar spray) in a completely randomized block design. A corn variety Single Cross 401 was the test crop. In most treatments, the residual P in the soil increased compared to its initial level (before culture). The application of the Zn spray recorded the highest residual Zn and lowest P relative to other treatments except control; and the control treatment yielded the lowest amount of residual Zn and highest P. At B control, the amount of residual available P in the soil was lower than other B levels. Boron application had no effect on the residual available Zn in the soil relative to the non B level. At Zn control, B application increased available P remaining in the soil relative to no B use, but at other Zn levels, it had no effect on the soil's P content. Therefore, the presence of Zn prevented from increase of the available P remaining in the soil by B use. Zinc application to the soil, though a less amount of Zn was absorbed by the plant but the Zn used remained and was used by the plant for later cultures. Also, the P fertilizer is fixed in the soil and will be used by the next plants.
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