Effects of Alternative Crops Cultivation on Soil Physico-chemical Characteristics and Crop Yield in Paddy Fields

Abstract

BACKGROUND:Cultivation of alternative crops in paddy fields is necessary because of the decrease in rice consumption and the increase in excess stock of rice. The study was conducted to investigate the effects of alternative crops cultivation in paddy fields on soil physico-chemical characteristics and crop yield. METHODS AND RESULTS: Soybean (Glycine max), red-clover (Trifolium pratense), and water convolvulus (Ipomoea aquatica) were selected for alternative crops in the first and/or second year and rice was planted in the third year. When alternative crops were cultivated in the previous year, soil bulk density, soil hardness, and water content were lower than those for rice cultivation. Water-depth decreasing rate and aggregate content were greater for the upland-upland-paddy cropping system than upland-paddypaddy cropping system. Cultivation of red-clover and water convolvulus for two years resulted in the high soil organic matter content. In the third year, available phosphate, exchangeable potassium, and soil cation exchange capacity were relatively high when soybean was cultivated in the previous year. In the first year, water convolvulus cultivation showed greater productivity than red-clover cultivation while the opposite pattern was found in the second year. Rice yield in the third year was greater for soybean or red-clover as a previous crop than for water convolvulus as a previous crop. CONCLUSION : The results suggest that cultivation of alternative crops in paddy fields can improve soil physical properties including bulk density, hardness, water content, and aggregate content as well as rice productivity.

Water-dispersible Clay Content in Summer Rainy Season for Korean Irrigated Rice Paddy Fields as Affected by Cultivated Years Using Heavy Agro-machinery and Soil Properties

“…농기계의 대형화로 써레질의 강도가 커지면 입단이 더욱 파괴되어 낙수 후 비담수기에 논 토양의 균열이 더 많아질 수 있다 (Zhang et al, 2016b). 또 한 분산성이 큰 토양은 입단화 정도가 낮아 최근 쌀 생산조정 등으로 요구되는 논 밭작물 재배시 토양물리성이 불량하여 생육 및 수량을 제한할 수 있다 (Han et al, 2017). 강우시는 토괴 사이 균열을 통해 용존태 및 현탁태 물질의 지하용탈이 발생할 수 있다 (Kretzschmar et al, 1999: White, 1985Zhang et al, 2015 2).…”

Evaluation of the Characteristics of Pollutant Discharge in Tomato Hydroponic Wastewater (HWW) for Sustainable Water Management in Korea

“…During the winter season in Korea, rice production is not possible, so the paddy fields are generally dormant. To address the instability of the rice market and difficulties in farm management, the Korean government has invested heavily in rural livelihood improvement and income enhancement (e.g., fostering successor workers, increasing farm income, regional revitalization projects, rural welfare projects, the cultivation of alternative crops, and the horticulture industry) [5][6][7][8][9][10].…”

Effect of Mixed Organic Fertilizer on Growth, Yield and Component Content of Saururus chinensis Baill in Paddy Field Cultivation

“…최근 벼 재배면적은 779천 ha (2016)에서 711천 ha (2018)로 감소 추세이며, 국민 1인당 쌀 소비량은 1995년 106.5 kg에서 2015년 62.9 kg으로 감소하였다. 그러나 이상기후 등에 따라 쌀 부족 문제가 대두될 수 있고 국제 곡물가가 급 등할 수 있으므로, 식량사정에 따라 논과 밭으로 탄력적으로 이용할 수 있는 논의 관리체계가 필요하다 (Han et al, 2017). 논을 밭으로 이용하면 입단형성, 지력 증진, 통기성 증가, 병충해 억제, 수량증대 효과 (Lim et al, 2014;Youn et al, 2015)…”