Abstract
This study was aimed to determine the nutrient status and population of arbuscular mycorrhizal fungi (AMF) on the second cropping cycle of corn-based cropping patterns which utilized indigenous mycorrhizal fungi on sandy soil. The experiment was conducted at the Akar-Akar village in Bayan district of North Lombok, in a Randomized Block Design, with 4 replications and 6 treatments of cropping cycles (P0 = corn-soybean as a control, in which the corn plants were not inoculated with AMF; P1 = corn-soybean, P2 = corn-peanut, P3 = corn-upland rice, P4 = corn-sorghum, and P5 = corn-corn, in which the first cycle corn plants were inoculated with AMF). Results indicated that the status of N, P, K and organic-C increased significantly up to 112%, 148%, 88%, 88% at 60 DAS and 66%, 135%, 54%, 60% at 100 DAS, respectively in the second cropping cycle of sorghum compared to control. Uptake of N, P, K and Ca the sorghum plants at 60 DAS of the second cropping cycle reached 200%; 550%; 120% and 490%, respectively a higher than in the control. Mycorrhizal populations (spore number and infection percentage) were highest in the second cycle sorghum, achieving 335% and 226% respectively, which were significantly higher than those in the control.
Highlights
The limiting factors such as water availability, poor nutrient and soil organic matter are the root of the problems in an effort to increase maize yield on sandy soil in dryland area of North Lombok
Since different cropping patterns would indicate different increases in the nutrient status and populations of arbuscular mycorrhizal fungi (AMF), this study has revealed nutrient status and AMF population on some crops of the second cycle of cropping patterns after the first cycle of AMF inoculated and uninoculated corn crops had been harvested
The cropping pattern as the control treatment was cornsoybean without AMF inoculation (P0)
Summary
The limiting factors such as water availability, poor nutrient and soil organic matter are the root of the problems in an effort to increase maize yield on sandy soil in dryland area of North Lombok. Another constraint is the highly dependency of the implementation of agriculture intensification on the use of inorganic fertilizers. Of the N fertilizer applied, at most only 50% is absorbed by the crop roots and the rest is left behind or lost from the soil. One of the ways for solving the problems is to utilize
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