Environmental Sciences, asked by barwarsunita94, 8 hours ago

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Answered by saxenatejas784
3

1.Harvesting-Cutting of crop plants after maturation is called harvesting. It is done by cutting the crop plants close to the ground or pulling the crop plants. Threshing-Separation of grains from chaff is called threshing.

2.Weeding can be defined as the removal of weeds (unwanted plants) from the field. Weeding is necessary because weeds compete with main crop plant for the different factors such as water, sunlight, nutrients and space and hence affect plant growth. Due to unwanted plants, there is reduction in yield also.

3.The Plough was used for farming and cultivation of soil preparation for sowing. Whereas a Hoe is a hand tool used by small farmers and vegetational crops. Farmers have been using plough since time immemorial. Ploughs were traditionally drawn by oxen and horses, but in modern farms are drawn by tractors.

4.Particulates are generated during the agricultural operations and processes. The “particulates” (or particles) is a term referring to fine solid matter dispersed and spread by air movement (Förstner, 1998). ... Ultrafine particles generally defined as the particles less than 0.1 microns.

5.Winnowing is a process by which chaff is separated from grain. It can also be used to remove pests from stored grain. Winnowing usually follows threshing in grain preparation.

6.Field Fellows coordinate a specific project or program at the Center of Development in India and gain hands-on experience by supporting local staff on various projects and programs.

7.These crops are usually sown at the beginning of the monsoon season around June and harvested by September or October. Rice, maize, bajra, ragi, soybean, groundnut, cotton are all types of Kharif crops.

8.The crops that are sown in the winter season are called Rabi crops. (also known as the "winter crop") in India. The Rabi means, when the crop is harvested. Crops that are grown in the winter season, from November to April are called Rabi Crops. Some of the important rabi crops are wheat, barley, peas, gram and mustard.

9.Manure is an organic substance that is obtained from decomposition of vegetables and animal waste. Fertilizers are inorganic substances manufactured in factories. Manures are relatively less rich in plant nutrients, they only remove general deficiency of soil.

10.The process of watering the crops is called irrigation. Two methods of irrigation are: (i) Sprinkler system : This system is used on the uneven land where less water is available. ... (ii) Drip irrigation: This system is used to save water as it allows the water to flow drop by drop at the roots of the plants.

11.If wheat is sown in the Kharif season (from June to October), then the whole crop might get destroyed because of many factors such as lack of optimum temperature, adaptability, availability of pests, etc. Kharif season includes the rainy season, which is not favourable for the growth of the wheat crop.

12.If there is a continuous plantation of crops in the field the soil will lack nutrients and the soil will become poor in nutrients and minerals. When there is continuous plantation the nutrients in the soil will reduce and the crop yield will also reduce.

13.

Answered by Anonymous
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Haaye Sandhya.

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teacher garam.

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