Pregnancy Weight Gain: Facts. 1  For women who were a normal weight before pregnancy with a BMI of 18.5-24.9 the recommended weight gain guideline is 25-35 pounds. 2  Women who are underweight pre-pregnancy with a BMI of less than 18.5 should gain between 28-40 pounds unless your health care provider says differently.
Tilth generally refers to the physical condition of the soil as it relates to plant growth. Favorable tilth implies good conditions for seed germination and root proliferation, allowing crops to thrive.
Clay is the smallest of particles. Clay is smooth when dry and sticky when wet. Soils high in clay content are called heavy soils. Clay also can hold a lot of nutrients, but doesn't let air and water through it well.Particle size has a lot to do with a soil's drainage and nutrient holding capacity. To better understand how big these three soil particles are, think of them like this.lay is the smallest of particles. Clay is smooth when dry and sticky when wet. Soils high in clay content are called heavy soils. Clay also can hold a lot of nutrients, but doesn't let air and water through it well.