4.7 Article

Tillage and cropping sequence effect on physico-chemical and biological properties of soil in Eastern Himalayas, India

期刊

SOIL & TILLAGE RESEARCH
卷 180, 期 -, 页码 182-193

出版社

ELSEVIER
DOI: 10.1016/j.still.2018.03.005

关键词

Conservation tillage; Efficient crops; Soil health

资金

  1. ICAR Research Complex for North Eastern Hill Region, Umiam, Meghalaya, India
  2. College of Post Graduate Studies, Central Agricultural University, Umiam, Meghalaya, India

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Poor soil quality and low fertility are major limitations to agricultural intensification and increasing crop productivity under rainfed hill ecosystems of North Eastern Region (NER) of India. Intensive tillage and adoption of mono-cropping of rice (Oryza sativa L.) or maize (Zea mays L.) leads to depletion of soil fertility and crop productivity. A three year field experiment (2007-2010) was conducted at mid altitude of Meghalaya, India with eight cropping sequences [maize-rapeseed (Brassica campestris L. var. toria.), maize-pea (Piston sativum L.), rice (Oryza saliva L.)- rapeseed, rice-pea, ricebean (Vigna umbellate Thunb.)-rapeseed, ricebean-pea, soybean (Glycine max L. Merr) - rapeseed and soybean -pea] under two tillage systems; conservation tillage (CST) and conventional tillage (CT). The objectives were to assess impact of tillage and cropping sequence(s) on soil quality and fertility after three years of the experiment. Soil moisture content and infiltration rate were significantly improved under CST relative to those under CT. The soil organic carbon (SOC) concentration was significantly higher under CST (23 g/kg) relative to that under CT (21.2 g/kg) at 0-15 cm soil depth. Available nitrogen (N), phosphorous and potassium, soil microbial biomass carbon (SMBC) and dehydrogenase activity (DHA) were also significantly higher in CST than those under CT. The cropping sequences did not affect the bulk density (rho(b)) and SOC significantly. However, available N, SMBC and DHA concentration were significantly higher under soybean pea and soybean -rapeseed sequences as compared to others. During 2009-10, where rainfall received during the winter season was negligible, 4-70% higher yields of winter crops were observed under CST than those under CT. Thus, adoption of CST and soybean based cropping sequences offers an alternative to raise crops during the winter season on residual soil moisture and improve soil quality in eastern Himalayas.

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