Organic Phosphorus Fractions in Soil Fertilized With Cattle Manure

Abstract

Inorganic phosphorus (Pi) usually controls the P availability in tropical soils, but the contribution of organic P (Po) should not be neglected, mainly in systems with low P input or management systems that promote organic matter accumulation. The aims of this study were to evaluate the changes in the Po fractions over time in soil fertilized and not fertilized with cattle manure and to correlate Po forms with available P extracted by anion exchange resin. The experiment was carried out under field conditions, in a sandy-clay loam Haplustox. The experimental design was a 2 × 9 randomized complete block factorial design, in which the first factor was manure application (20 t ha -1 ) or absence, and the second the soil sampling times (3, 7, 14, 21, 28, 49, 70, 91, and 112 days) after manure incorporation. Labile, moderately labile and non-labile Po fractions were determined in the soil material of each sampling. Manure fertilization increased the Po levels in the moderately labile and non-labile fractions and the total organic P, but did not affect the Po fraction proportions in relation to total organic P. On average, 5.1 % of total Po was in the labile, 44.4 % in the moderately labile and 50.5 % in the non-labile fractions. Available P (resin P) was more affected by the manure soluble Pi rather than by the labile Po forms. The labile and non-labile Po fractions varied randomly with no defined trend in relation to the samplings; for this reason, the data did not fit any mathematical model.

Application of cow manure and inorganic fertilizer in one season and carryover of effects in sesame on tropical ferruginous soils

“…-1 combined with 0 kg . ha -1 of NPK fertilizers was consistent with Braos et al (2015)"s findings. In fact, these authors reported an increase in soil pH after applying 20 t .…”

Improving Farming Practices for Sustainable Soil Use in the Humid Tropics and Rainforest Ecosystem Health

“…The P organic rarely represents a major portion of soil P. In soil, inorganic P can be found in labile and non-labile forms and according to the degree of stability or solubility. P inorganic can be found in soil solution and fixed through adsorption, with oxides of Fe and Al (of clay fraction) [150]. This process establishes either weak adsorption (labile P) or strong adsorption (moderately labile P) with these oxides and, precipitated with Al, Fe, and Ca, establishes insoluble forms (non-labile P) [150].…”

“…P inorganic can be found in soil solution and fixed through adsorption, with oxides of Fe and Al (of clay fraction) [150]. This process establishes either weak adsorption (labile P) or strong adsorption (moderately labile P) with these oxides and, precipitated with Al, Fe, and Ca, establishes insoluble forms (non-labile P) [150]. Changes in the soil-P pools are affected by chemical and biological processes.…”

“…Braos et al [150] reported that the contribution of soil organic P (Po) to increase available P (labile P) can be more relevant when organic fertilization or other practices that increase the SOM content are part of the soil management. However, plant and microbial strategies need to be further improved, particularly the uptake of residual soil P (from applied fertilizers and manures) and subsoil P uptake [151].…”

Phosphorus Fractions and Phosphorus Adsorption Characteristics of Soils from the Water-Level Fluctuating Zone of Nansi Lake, China

“…NaOH-P concentration of soybean and wood land samples is two times that of reed land. The reason was probably that the lands of soybean, maize, and wood were all cultivated land, to which was added more inorganic fertilizer [19,20,37]. This suggests that soils in maize, soybean, and woodland have higher environmental concern than soils in reed land when this zone would be submerged.…”