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Influence of nitrogen on some soil properties and forage production of safflower and chinese cabbage with and without tree association

Hazra, C.R.; Tripathi, S.B.

Journal of the Indian Society of Soil Science 34(2): 275-280

1986


Accession: 001617816

Field experiments were conducted to evaluate the effect of four levels of nitrogen (0, 20, 40 and 60 kg ha-1) on some soils properties and yields of safflower (Carthamus tinctorius) and Chinese cabbage (Brassica pekinensis) grown in association with and without tree. On an average, safflower and Chinese cabbage responded up to 40 and 60 kg N ha-1 respectively in both the cases. The average photosynthetically active radiation (PAR) availability under tree cover was about 68 and 60% of full radiation for safflower and Chinese cabbage crops, respectively. Nitrogen uptake by crops increased with N application but the additional removal decreased with the increase in N application. Under non-fertilized condition, safflower removed 17.0 and 9.5 kg N ha-1 while Chinese cabbage did so to the extent of 31.5 and 22.8 kg N ha11 in the open and tree canopy, respectively. Amount of N removed by Chinese cabbage was almost double of that by the safflower. Nitrogen application improved the organic carbon, available nitrogen and phosphorus status of the soil. The improvement in soil properties was more under tree canopy than in the open.

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