Lee, Jong-Tae
(Onion Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
,
Kim, Hee-Dae
(Onion Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
,
Lee, Sang-Dae
(Onion Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
,
Ro, Chi-Woong
(Onion Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
A two year study was conducted on the effects of composted pig manure applications on organically managed intermediate-day onion ($Allium$$cepa$ L.) with mid-season production. The manure application rates were 0, 4.0, 6.0, and 8.0 $ton{\cdot}ha^{-1}$, and accompani...
A two year study was conducted on the effects of composted pig manure applications on organically managed intermediate-day onion ($Allium$$cepa$ L.) with mid-season production. The manure application rates were 0, 4.0, 6.0, and 8.0 $ton{\cdot}ha^{-1}$, and accompanied by organic fertilizer with 240 $kg{\cdot}ha^{-1}$ nitrogen for all treatments. There was a positive linear effect on the marketable bulb yield with increasing applications of pig manure. However, pig manure rates of 6.0 or 8.0 $ton{\cdot}ha^{-1}$ did not affect the marketable yields or bulb weights at harvest. There was no significant difference between pig manure application rates and mineral concentration or nutrient uptake in onion bulbs. Soil pH and electric conductivity (EC) were lower at harvest compared to preplant soil, while exchangeable potassium and calcium contents increased at harvest. However, there were no significant effects on soil pH, EC, and organic matter or exchangeable cations caused by different pig manure application rates. Mineralized $NO_3$-N content was not affected by pig manure application rates except at transplanting and 129 day after transplanting. Based on the results of this study, when organic fertilizer is applied at a rate of 240 $kg{\cdot}ha^{-1}$ N, 6.0 $ton{\cdot}ha^{-1}$ composted pig manure should be adequate for producing onions using an organic production system.
A two year study was conducted on the effects of composted pig manure applications on organically managed intermediate-day onion ($Allium$$cepa$ L.) with mid-season production. The manure application rates were 0, 4.0, 6.0, and 8.0 $ton{\cdot}ha^{-1}$, and accompanied by organic fertilizer with 240 $kg{\cdot}ha^{-1}$ nitrogen for all treatments. There was a positive linear effect on the marketable bulb yield with increasing applications of pig manure. However, pig manure rates of 6.0 or 8.0 $ton{\cdot}ha^{-1}$ did not affect the marketable yields or bulb weights at harvest. There was no significant difference between pig manure application rates and mineral concentration or nutrient uptake in onion bulbs. Soil pH and electric conductivity (EC) were lower at harvest compared to preplant soil, while exchangeable potassium and calcium contents increased at harvest. However, there were no significant effects on soil pH, EC, and organic matter or exchangeable cations caused by different pig manure application rates. Mineralized $NO_3$-N content was not affected by pig manure application rates except at transplanting and 129 day after transplanting. Based on the results of this study, when organic fertilizer is applied at a rate of 240 $kg{\cdot}ha^{-1}$ N, 6.0 $ton{\cdot}ha^{-1}$ composted pig manure should be adequate for producing onions using an organic production system.
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제안 방법
Soil pH and EC were measured by pH meter and conductivity meter. Soil used for analyzing inorganic nitrogen content was sampled at 17 day before transplanting and 1 day after transplanting (DAT), 101, 115, 129, 150, 164, 180, 192, 218 DAT, and contents were determined by reflectometry (RQ plus, Merck, Germany).
The objective of the present study was to evaluate the effects of different application rates of composted pig manure on onion growth, bulb yield, nutrient uptake, and soil properties for organic production of intermediate-day onions in paddy soil with applied organic fertilizer.
2 m2 per experimental unit and laid on top of the ground for 2 days before having their tops removed. They were then individually weighed to determine bulb weight, with damaged, diseased, bolted, and doubled onions sorted out. Five representative onion bulbs were selected for analyzing inorganic contents.
대상 데이터
The experimental unit was a 12 m long section of planted bed, accommodating 550 plants. The experimental designs each year consisted of randomized complete blocks with 3 replications.
Seven rows of onions were transplanted with 15 cm between rows and a 15 cm in-row spacing. The experimental unit was a 12 m long section of planted bed, accommodating 550 plants. The experimental designs each year consisted of randomized complete blocks with 3 replications.
이론/모형
N was measured by the Kjeldahl method. P was measured colorimetrically with the ammonium-vanadatemolybdate method (Gericke and Kurmies, 1952). Atomic absorption spectrophotometry was used to determine K, Ca, and Mg contents (Slavin, 1968).
OM was determined by the Tyurin method (Schollenberger, 1927). The Lancaster method was used to determine the available P (RDA, 2002). The method involves using 5 g soil, which is extracted with 20 mL of 0.
성능/효과
In conclusion, when organic fertilizer is applied to preplant soil at a rate of 240 kg･ha-1 N, additional pig manure application at the current rates was not effective for increasing bulb yield, and increased farmers’ management costs.
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