Mapping of Some Maize Growing Areas of District Swabi on The Basis of Phosphorous Mineralization

Year 2019, Volume: 2 Issue: 1, 51 - 57, 01.01.2019

Aftab Jamal , Muhammad İlyas Durrani Muhammad Sarirullaha Sarir

Abstract

Laboratory incubation
study was conducted to assess the changes in soil Phosphorous (P) concentration
of some maize growing areas of district Swabi with time. A total of twenty two
rhizosphere soil samples were collected from important soil series of some maize
growing areas of district Swabi. 400 g soil from each series was incubated for
6 weeks at field moisture condition and 25±2⁰C.P was determined
periodically after each week. All the soils were also analyzed for
physico-chemical properties and micronutrient status. Almost all the soil
samples were found normal, alkaline in reaction, low in organic matter content
and slightly to strongly calcareous in nature, all the soil samples were found
silty clay loam in texture except Chota Lahore soil which was found sandy loam
in texture. Results showed periodical changes in soil AB-DTPA extractable P
over incubation period. When averaged across all soil series P increased from
8.15 at week 0 to 9.14 at week 2 which declined at week 3 and increased again
from  8.84 at week 3 to 12.0 at week 5  but then declined again to 9.89 at week 6.
Mean rate of P turnover was -0.32, 0.46, 0.20, 0.57, 0.7 and 0.28 mg kg^-1
wk^-1 at week 1, 2, 3, 4, 5 and 6 respectively. P turnover was
affected by initial P concentrations at all levels of incubation, giving high
net P turnover in low P soils followed by medium P soils. These mineralized P
from insoluble sources should be considered while making recommendation for low
or medium P soils.

Keywords

Incubation, Mineralization, Mapping, Swabi

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