Critical Limit Of Zinc In Soil

The available zn content of soils was estimated by seven extractants and the amount of zn extracted followed the order of 0 005 m dtpa ph 7 3.

Critical limit of zinc in soil.

Among three extractants zn. A study was conducted in 22 alluvial soils of west bengal india to estimate the critical limit of zn in soil and rice plant for predicting the response of rice oryza sativa to zinc application. The soil contained caco3 0 33 7 54 ph 6 2 8 8 ec 0 27 1 6 dsm 1 and organic carbon 2 7 11 4 g kg 1. However a substantial amount of average dry matter yield decreased with increasing levels of applied zinc fertilizer in the soils containing zn above critical limit up to 5 0 mg zn kg 1 soil.

Zinc deficiency is also noticed in the soil derived from parent. Pea pisumsativum l cv. The treatments consisted 0 2 5 and 5 0 kg zn ha 1 as znso4 7h2o and recommended dose of nitrogen phosphorus and potashas urea single super phosphate and muriate of potash were used. Som and on organic soil s.

A pot culture experiment was conducted to determine the critical limit of zn for rice grown in veeranam command area vertisol and entisol. Zinc zn plays a substantial role in many biological processes and is an essential trace element for proper growth and reproduction of plants and health of animals and humans. The critical zn concentration in soil and plant below which plant response to zn application to the soil may be expected was 0 78 and 19 ppm respectively. Soil z n ppm critical limits of zn in soil fig.

It is an important stable food that provides 66 70 per cent body. Critical limit of 20 mg zn g dw at high level of p application 27 mg kg 54 55. The critical limit of zinc in soil and plant was found to be 0 64 and 22 0 mg kg 1 respectively. Critical limits of zinc in soil at harvest 0 0 20 0 40 0 60 0 80 0 100 0 120 0 50 0 52 0 54 0 56 0 58 0 60 0 62 0 64 0 66 0 zn content ppm b r a y s y i e l d fig.

Introduction rice is a stable food for about 50 percent of the world s population that resides in asia where 90 per cent of the world s rice is grown and consumed. Among three zinc extrantants dtpa hcl and ammonium acetate only dtpa zinc extractant was significant and positively correlated with bray s per cent yield and chemical properties such as ph o c and available nitrogen. Critical limits of zinc in plant at 30 das. Rice soil critical limit zinc applications.

It has also been reported to cause contamination of soil water and food chains in human beings zn deficiency is associated to diet quality exacerbated by zn deficient soils 4 5. The dtpa extractable zn was positively and significantly correlated with cec organic carbon and clay contents and negatively correlated with ph silt and sand contents of soil.