《Table 7–Effect of P-enriched compost on post-harvest soil available P, EC, and pH.》

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《Influence of P-enriched compost application on economics and P use efficiency of a maize–wheat rotation system》

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P uptake in plant dry matter of maize and wheat significantly（P≤0.05）increased relative to the control.Maximum P uptakes（23.62，23.71，and 25.07 kg ha-1）by maize grain and（10.53，8.72，and 9.80 kg ha-1）by stalk were observed under PEC treatment in the three respective years（Table 2）.Nonsignificantly different P uptakes in grain were recorded with RD NPK and RD NPK+FYM treatments during the three years；under RD NPK，18.40，18.73，and 18.36 kg ha-1and with RD NPK+FYM，20.85，19.84，and 20.79 kg ha-1phosphorus uptake by maize grain was observed（Table 2）.These results also showed that higher P uptakes by wheat grain and straw were achieved with RD NK+PEC than with RD NPK+FYM application（Table 3）；values of 12.80，13.35，and 12.42 kg ha-1in grain and 4.68，4.12，and 5.04 kg ha-1in straw were recorded in the respective 2011–2012，2012–2013，and 2013–2014 cropping seasons，both significantly higher than those under control treatments.Similarly，Taalab et al.[18]reported that plant P uptake was increased by the combination of rock phosphate with organic manure.P uptake and dry matter yield of crops were improved by application of chemical fertilizer enriched with organic manure[6].On average over the three years，the application of PEC to maize led to 30%and 17%higher P uptakes in grain and stalk and in wheat to 29%and 35%higher P uptakes in grain and straw，respectively，than sole RD NPK fertilizer application.Comparison of RD NK+PEC and RD NPK+FYM application showed that 18%higher P uptake in maize grain，8%higher P uptake in maize stalk and similarly18%higher P uptake in wheat grain and 3%higher P uptake in straw，were recorded with PEC addition relative to RD NPK+FYM application.Thus，P fertilizer enriched with organic manure significantly increased plant P uptake and yield of crops，in accord with previous findings[6].