Effects of Long-Term Compost and Fertilizer Application on Soil Phosphorus Status Under Paddy Cropping System

Phosphorus Balance and Soil Phosphorus Status in Paddy Rice Fields with Various Fertilizer Practices

“…Additional P was supplemented using compost and other soil amendments (Nishio, 2002(Nishio, , 2003Mishima et al, 2003). Lee et al (2004) and Park et al (2004) demonstrated that P fertilization at the rate of 45 to 56 kg ha -1 yr -1 , comparable to our T1 plots and the nation-wide average, led to the increase in total P content in paddy soil. Indeed, P accumulation has been increasing throughout Japan (Goto et al, 2003;Obara and Nakai, 2004).…”

Phosphorus Status in Soils of Eastern Dry Zone, Karnataka

“…Hasan (1996) reported that the available phosphorus status in Karnataka was ranged from low (16 %) to medium (3 %). Myungsu Park et al, (2006) reported that the higher level of P remaining in the soil is accumulated by long-term annual application of compost and chemical fertilizers than by that of chemical fertilizer, and P accumulation might be a gradual saturation of the P-sorption capacity.…”

“…Third, when soluble phosphorus sources such as those in manures and fertilizers are added to soil, they are readily transformed into unavailable forms and with time react further to become highly insoluble forms. Levels of different pools of soil P have been affected not only by soil properties and climatic condition but also by rate and type of P applied (Myungsu Park et al, 2006).…”

Influence of Different Levels of Phosphorus and PSB Seed Treatment on P Fraction in Soil at Different Growth Stages of Groundnut (Arachis hypogaea L.)

“…This may be due to mineralization by micro-organism and crop uptake. It increases at harvest due to stimulated plant growth and accumulation of organic material in soil contributes to higher organic P in soil (Park et al, 2004) Application of 50 kg P 2 O 5 ha -1 as DAP (T 7 ) recorded higher organic P (314.18, 298.32, 285.66 and 292.93 mg kg -1 , at 30, 60, 90 DAS and at harvest, respectively) compared to other treatments. Only PSB seed treatment in T 2 treatment recorded lowest organic -P value.…”