Abstract
The purpose of this study was to determine the parameters of soil fertility in rice fields and the effect of soil fertility on paddy productivity in Bogor Regency. This research was conducted in the districts of Cileungsi, Darmaga and Leuwiliang, Bogor Regency. The location selection was done deliberately based on the location of rice production facilities with Ciherang and Inpari varieties. Sampling was conducted at several sampling points at each location. Each sub-district was taken 8 samples or 24 in total, then analyzed in the laboratory. Data processing using multiple regression with a dummy. The results showed that the soil in Bogor Regency was generally acidic, where soil fertility characteristics with organic C content were low to moderate, nitrogen was very low to moderate, P was low to high, K was very low to moderate, CEC was moderate to high, and saturation bases (KB) are moderate to high. Soil biology, namely total bacteria, total fungi, total solvent P bacteria, Azotobacter sp., And Rhizobium sp. Are generally low to moderate. Variable characteristics of soil fertility in the form of organic C, Nitrogen (N), K2O HCl 25%, and CEC significantly influence rice productivity. Soil fertility in the three districts is almost the same and does not affect the productivity of rice fields. While the productivity of rice fields with Inpari varieties is higher than those grown by Ciherang varieties. To increase the productivity of rice fields in Bogor Regency, it is recommended to plant Inpari variety rice by applying N fertilizer
Highlights
ATJ/4.2; 61 -68; December 2019 programs is an effort by the government so that Indonesia can be self-sufficient in rice
Achievement of the national rice production target is 70.6 million tons of GKG in 2011 and rice stock reaches a surplus of 10 million tons in 2015
Rice production continues to decline while food needs such as rice are getting higher, so it is necessary to take action to monitor the status of soil fertility, so that it can provide fertilizer recommendations in accordance with the location and needs of the crop being cultivated, by conducting a research study on the status of soil fertility in Bogor Regency (Ali, 2019)
Summary
Based on the results of laboratory analysis showed that the rice fields in the District of Cileungsi P2O5 HCl 25% ranged from 6 - 178 me / 100 g (classified as very low to very high) and P2O5 Bray content ranged from 0.53 - 18.24 ppm P (classified as very low to very high), Darmaga District content of P2O5 HCl 25% ranging from 9 - 182 me / 100 g (classified as very low to very high) and content of P2O5 Bray ranging from 0.00 - 27.41 ppm P (classified as very low to very high), and Leuwiliang District content of P2O5 HCl 25% ranges from 49 - 88 me / 100 g (classified as high to very high) and P2O5 Bray content ranges from 0 ppm P (classified as very low) This situation is caused because the soil is formed from parent material (rock / mineral) which is poor in P element and the P content in organic matter is low As stated by Munawar (2013) that P in the soil comes from the disintegration of P-containing minerals such as apatite, and decomposition organic matter. Soil organisms (microorganisms) are important in soil fertility because: 1) Play a role in the energy cycle. 2) Has a role in the nutrient cycle, 3) Has a role in the formation of soil aggregates. and 4) Determine soil health (suppressive / conducive to the emergence of diseases, especially diseases of soil borne pathogen)
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