Agronomy - Study Mode
[#76] 0.72% Organic carbon in the soil will be classified as
Correct Answer
(B) Medium
Explanation
Solution: Soil organic carbon is a measurable component of soil organic matter. Organic matter makes up just 2 - 10% of most soil's mass based on composition. While carbon is the main constituent of organic matter and it plays important role in enhancing the fertility, water retention capacity and texture of the soil. Approximately 0.51% of carbon in organic matter can be considered as medium availability.
[#77] The optimum seed rate (kg/hectare) for getting desired population of castor is
Correct Answer
(B) 18 - 20 kg/hectare
Explanation
Solution: The optimum seed rate of castor plantations is approximately 18 - 20 kg/hectare for the desired population. Plant population and arrangement in the cropping system should be properly designed to maximize the seed yield of short height genotypes of castor.
[#78] The Law of Optima was proposed by
Correct Answer
(B) Blackman
Explanation
Solution: The Law of optima or the law of limiting factors has been proposed by Blackman in 1905. This law comes into effect when any biochemical process in any organism is affected by several factors. This law states that if a chemical process is affected by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value.
[#79] In tobacco, the basic aim of topping and desuckering is to
Correct Answer
(C) Divert energy and nutrients from flower heads to leaves
Explanation
Solution: Topping and desuckering is a practice widely used on a tobacco plantation. The main aim of this practice is to divert the energy and nutrients from flowers to the leaves, to increase the leaf size and its quality because tobacco yield is dependent on leaf quality and quantity.
[#80] The huskless variety of barley is
Correct Answer
(C) Dolma
Explanation
Solution: Dolma is the husk with less variety of barley. This variety is quite suitable to be grown in rain-fed and hilly areas of Himachal Pradesh and Uttarakhand. It is fairly resistant to yellow rust. Its life cycle is 140 - 150 days.