Fertilizers and Pesticides Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.Like the improvements to irrigation and crop rotation, fertilizers and pesticides were developed long ago but have benefited from substantial advances in the last century. Like the improvements to irrigation and crop rotation, As irrigation's and crop rotation's improvements, Like those of irrigation and crop rotation, As it is of irrigation and crop rotation, Like irrigation and crop rotation, Review Answer