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Articles by I.P. Handayani
Total Records ( 3 ) for I.P. Handayani
  I.P. Handayani and P. Prawito
  Understanding folk knowledge of soil offers broader insight to help design more appropriate participatory agricultural research programs and facilitate better communication with farmers. To address this issue, semi-structured interviews were conducted with 90 farmers (age > 20 years) from three villages in Bengkulu Province, Sumatra, Indonesia. The objective of this study was to explore the folk knowledge toward soil classification, soil fertility, soil degradation and soil management. Farmers used 11 criteria to classify the soils. They described nine soil classes based on color and texture. Common colors for fertile soils are black, brown and mixed brown-black, but infertile soils are red and red-yellow. To better manage the soils, farmers recognized the importance of manures, crop residues and compost as soil amendments and legumes in cropping systems. Two-year fallow was commonly applied by farmers to restore soil fertility after five years of cultivation. This study suggests that there is a need to maximize the benefits of local knowledge of soil by combining it with scientific knowledge to enhance rural development projects, help precision farming and better manage natural resources.
  I.P. Handayani , M.S. Coyne and R.S. Tokosh
  The study was conducted to evaluate the influences of tall fescue management on soil organic matter fractions and macro- and microaggregate distribution. Soil samples were collected from four paired adjacent fields consisting of five years of tall fescue mono and poly stands in Western Kentucky. Soil samples from 0 to 15 cm and 15 to 30 cm soil depths were analyzed for soil organic C and N, particulate organic matter C (POM-C) and N (POM-N), macro- and micro aggregate distribution and C-associated with macro- and micro- aggregates. Significant effects were observed between stands for all the properties, except total C, microaggregates and C-associated with microaggregates. Sampling depth significantly influenced total C and N in both stands. Particulate organic matter C and N and C-associated with macroaggregates and the amount of macroaggregates were strongly affected by tall fescue management. This confirmed the hypothesis that early changes in soil properties were reflected in labile C and N fractions and soil structure. Tall fescue mixture stands had 44% higher POM-C, 50% higher POM-N, 26% more macroaggregates and 33% more C-associated with macroaggregates compared to the tall fescue mono stands at the soil surface of 0 to 15 cm.
  I.P. Handayani , P. Prawito and M. Ihsan
  Imperata grassland is recognized as environmental threats causing low land productivity. This has increased the need to assess the effect of grassland conversion to agricultural fields on soil. Undisturbed and disturbed soil samples were collected from Bengkulu Province, Sumatra, Indonesia. We used five different land management practices such as Imperata cylindrica dominated grassland as a reference, cassava field, banana field, legume field and agroforestry. Result shows that 6-year of cassava cultivation decreased 35% of soil water content at field capacity, 23% of water holding capacity, 11% of porosity, 13% of organic C and microbial biomass C, 32% of inorganic N and 10% of mineralizable C. Conversion to banana field only lowered C organic about 6% and soil microbial biomass C up to 8%. Conversion to legume fields and agroforestry significantly increased all the soil properties tested. Agroforestry system has maintained higher soil C and N levels than the other fields. On average, degradation index in cassava field was 11%. The aggradation index has increased from banana field (14%), agroforestry system (37%) and legume field (38%). In conclusion, conversion of Imperata grassland to conservative agricultural land is considered one way to improve soil ecosystem.
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