Nutrient uptake in cotton in relation to plant architecture
SummaryThe studies on uptake of nitrogen, phosphorus and potassium by two morphologically contrasting varieties of cotton MCU-1 and PRS-72 (bothGossypium hirsutum L.) at weekly intervals, showed that till the bursting of early formed bolls, the former type accumulated these nutrients in larger quantities in leaves and stem than in the fruiting parts unlike the latter type where differences in nutrient contents of these organs were very narrow till the active bolling phase. From flowering onwards, the fruiting parts of PRS-72 contained more phosphorus. Because of its bushy habit more dry matter accumulated and more nutrients remained unutilised in leaves and stem of MCU-1 at harvest compared with the short-branch variety PRS-72. Though both the varieties gave the same yield of seed cotton per unit area, PRS-72 removed considerably less quantities of nitrogen, phosphorus and pottassium. The short fruiting branch character in cotton therefore appears to contribute substantially towards balanced and economic utilization of nutrients.
Rendimiento y calidad de fibra de algodón en respuesta al número de riegos y dosis de nitrógeno
Resumen es: Las variedades de algodon cultivadas en Mexico son de ciclo largo y de gran desarrollo vegetativo por lo que requieren de cuatro riegos de auxilio y de u...
The Calcium and Potassium Nutrition of Cotton as Influenced by Sodium.
pursued for growing strength be not disturbed. You are carrying on an experiment with endowed endowments, and I hope it may remain the permanent policy of the American Society of Plant Physiologists, to let this experiment run for a century or two, just to see what it can do. Nothing would be more thrilling to me than to see it result in a continued spectacular success. I have always been proud and glad that it was the plant physiologists who were reaping the rewards of prosperity and success. Let us do nothing to break the accumulation of strength in the financing of our work. In the future, generations of plant physiologists yet unborn will rise up to call you blessed, if you maintain what you have. As a result of all these factors, we now have Plant Physiology dinners, without too much pomp and circumstance; we have a magazine which holds the respect of the world; we have considerable endowment, but not enough to worry anyone. Protected and conserved, in time it should give you some security, but nothing to waste. Personally, I have felt that the long struggle was worth the effort; and none of you can look back over the years in retrospect, with greater satisfaction. The American Society of Plant Physiologists is, however, a tool for the invigoration and promotion of our research programs. It is the latter, the researches of this group, that make the most important contribution to the public good. Our research must go forward in two great realms. One of these deals with the responses of the plant to all kinds of environmental factors: temperature, water, light, nutrition, antibiotics, radiations other than light, etc., which if not superficial, are at least more or less external factors. This stream of investigation is important to any program of controlled plant production. It has large value in such special regions as floriculture, horticulture, forestry, agronomy, and related subjects. Plant management requires the constant application of this type of research. To my mind, however, a far more important contribution must be made to an understanding of the plant's life. Every phase of the building of the plant's body is still in need of continuous research. The entire interior of the plant is made up of complicated physical and chemical systems, integrated and cooperating to carry forward the processes of building, of life, of decay, etc. Enormous ranges of physiology are still shrouded in mystery. This internal physiology is of the utmost importance to the proper understanding of life. It will require all of the skill of the biophysicists and biochemists, new techniques, and long patient research to unravel the complications of the internal chemistry and physics of the plant. As we go more and more deeply into these problems, they will necessarily become more complex, more confusing and confused, more difficult to untangle. Enzymes, hormones, all kinds of biotic substances are involved in the manifestations of life. The origin of each reactant within the plant must be known, and the series of reactions which stand between the origin of material and the end result of reacting substances must be known and understood in all of their complexities before we can have a true picture of that internal mechanism. It is only by such an integration that we can understand even the origin of the plant's morphology. If one could only live through several centuries of research, it would be a thrilling experience to follow the gradual elucidation of all of the physiological processes in relation to each other. It is my unshakeable belief that the organized work of this group can, in the long run, contribute immeasurably toward this more complete understanding of the processes whereby each plant comes to be what it is. It is fascinating to contemplate the slow but sure progress that is being made, and I rest in the complete assurance that, with the sound beginnings which have been made, and with the friendly fellowship which now pervades among all plant physiologists, the future will be ever more fruitful and satisfying to each and every one of you. It is my privilege to stand upon the shore, soon to shove off on new adventures, to wave my hands in fond greetings to all of you, and to wish you all the success which I am sure you will have richly deserved. Let me close with those famous words which the poet Catullus spoke at his brother's tomb: "Ave atque vale! " Hail, and farewell!