Challenges in Improving Agricultural Production — Important Questions

Rhizobium bacteria

Step 1: Rhizobium bacteria form a symbiotic relationship with leguminous plants like soybean, Bengal gram, and other pulses. Step 2: These bacteria live in small nodules formed on the roots of legume plants. Step 3: They have the ability to convert atmospheric nitrogen gas into ammonia, which plants can use. Step 4: In return, the plant provides carbohydrates and shelter to the bacteria. Step 5: This biological nitrogen fixation reduces the need for chemical nitrogen fertilizers and enriches soil naturally, as mentioned in the biofertilizer section of the chapter.

2,430 kg/hectare

Step 1: From Table 2, planting immediately after onset of rains gives 5,830 kg/hectare production. Step 2: Planting a month after onset of rains gives only 3,400 kg/hectare production. Step 3: The gain is calculated as: 5,830 - 3,400 = 2,430 kg/hectare. Step 4: This demonstrates the critical importance of proper timing in agricultural practices. Step 5: Early planting allows crops to utilize the full rainy season for growth and development, leading to significantly higher yields.

46%

Step 1: Table 8 shows the nutrient composition of different chemical fertilizers. Step 2: Urea contains 46% nitrogen, 0% phosphorus, and 0% potassium. Step 3: This makes urea a pure nitrogen fertilizer, commonly used when crops need nitrogen supplementation. Step 4: The high nitrogen content makes it efficient for promoting leaf and stem growth. Step 5: Other fertilizers like ammonium sulphate contain only 21% nitrogen, making urea more concentrated and cost-effective for nitrogen supply.

Earthworms for decomposition

Step 1: Vermicompost is produced using earthworms to decompose organic waste materials. Step 2: The earthworms consume organic matter and excrete nutrient-rich castings. Step 3: The chapter mentions using 1000 earthworms per square meter in vermicompost beds. Step 4: This biological process creates high-quality organic fertilizer that improves soil structure and fertility. Step 5: Unlike chemical fertilizers, vermicompost enhances soil health, water retention, and microbial activity while providing slow-release nutrients to plants.