Which of the following soil sampling patterns are officially recommended to obtain a representative soil sample for accurate field analysis?

Phosphate availability is maximum in the pH range of

Soil pH is measured by making soil : water suspension in the ratio of

In general, longer the plant is in contact with nitrate, there would be

Which instrument is used for determination of K content in soil?

Which nutrient element imparts indirect drought resistance?

Phosphorus in DAP is

Which element was added as an essential nutrient in the year 1987?

Rating in soil is considered as low available Nitrogen status when it is

White bud of maize is due to deficiency of