Zinc and Phosphorus on yield in Aman rice and distribution in post-harvest soil

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M.A. Hye, K.M. Mahbubur Rahman, P.P. Das, M. S. Islam, M. A. Hossain, B.P. Ray*

Abstract

Many There were 3 levels of P (0, 25 and 50 kg P205 ha-I from TSP) and 4 levels of Zn (0, 5, 10 and 20 kg Zn
ha-' from zinc sulphate) along with basal doses of 100 kg N ha from urea, 40 kg K20 ha-' from mediate of
potash and 12 kg S ha" from gypsum. The single and interaction effect of P and Zn had significant positive
effect on the grain and straw yield. The highest grain yield (5.97 t ha-l) and straw yield (11.50 t ha-') were
obtained from Zn10 P50 treatment. Phosphorus application significantly increased the P content in grain and
straw but zinc content significantly decreased while effect of zinc significantly deceased the P content in grain
and straw but increased the Zn content. The highest amount of P content in grain and straw were 0.35% and
0.140% respectively obtained from Zn0 P50 treatment whereas the zinc content in grain and straw were 32.8
ppm and 50.60 ppm respectively obtained from Zn20 Po treatment. The availability of phosphorus gradually
increased with the increasing levels of P and decreased with the increasing levels of Zn. The maximum watersoluble
P (4.5mg kg-1) and labile P (1.8 mg kg-I) were obtained from Zn0 P50 treatment. The application of P
and Zn gradually increased the Al/Fe-P, Mg/Ca-P and Total P with the increasing levels of P and Zn. The
highest amount of Al/Fe-P, Mg/Ca¬P and Total-P were obtained from Zn2o P50 treatment. The combined
application of P and Zn increased the grain and straw yield but decreased P and Zn content and availability of P
to from Al/Fe-P and Mg/Ca-P as a result of Zn-P interaction in soil solution.

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