Full text of Agricultural News Letter : Vol. 9, No. 2
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V IC U F E D E R A L Vol. 9, No. 2 NEWS LETTER R E S E R V E B A N K O F DALLAS, TEXAS D A L L A S February 15, 1954 Soil Conditioners— A Progress Report Following the release to the general public of a soil conditioner in December 1951, there has been a great deal of publicity given to this material. Dozens of products have been placed on the market, and many people have used soil conditioners with a variety of results. However, in normal cultivation of crops, this desirable condition of the soil frequently dis appears early in the growing season. The crusting over of soils following heavy rains is one of the more frequent examples of the breakdown in soil structure. This crust ing over prevents the emergence of seedlings and, in many cases, sharply reduces the stand of a newly planted crop. Chemical soil condi tioners enable soils to withstand the effects of weathering and tillage machinery and still remain in a desirable physical condition. A summary of agricultural experiment sta tion results with respect to soil conditioners is useful in appraising the value of these ma terials. Reporting in a recent issue of the Crops & Soils magazine (published by the American Society of Agronomy), soil scien tists point out that the synthetic soil condi tioners currently being marketed are of four A second important point noted by the sci is that the chemical soil conditioners classes of chemical compounds: (1) poly- entists stabilize whatever soil structure exists at the vinylites, (2) cellulose gums, (3) lignin de time of application. In other words, if the soil rivatives, and (4) silicates. is crusted over at the time of applying the soil conditioner, the conditioner will have no bene About 90 percent of the individual prod ficial effect in attempting to break the crust. ucts now on the market belong to the polyvinylite family. The amount of active in gredients in each varies considerably, with a This is a very important point because recent study showing a range of 15 to 98 many people have come to believe that soil conditioners will bring about the existence of percent. a desirable soil structure. However, tests have Soil scientists generally are agreed that soil shown conclusively that the ground first must conditioners do at least one thing — they in be worked into the proper state of tilth and crease the stability of soil aggregates. Soil ag then the soil conditioner applied. gregates are the lumps or granules of soil. In Maintenance of the granular soil structure order for plants to achieve maximum growth, the soil must have a granular structure. This permits more rapid absorption of rainfall and is one reason for working the soil prior to better aeration of the soil, both of which aid planting. Plowing, harrowing, and cultivating plant growth. Tests have shown very definite make the soil loose, friable, and granular. increases in yields from the use of soil condi- 2 AGRICULTURAL NEWS LETTER tioners in situations where the problem of late for such planting, but with favorable weather between now and spring, these crops crusting or aeration existed. will pay big dividends during the early spring It is felt by many that the more satisfac months. tory physical characteristics maintained in Hubam or Madrid sweet clovers may be the soil treated with the conditioner also tend spring-seeded with good results in small-grain to lower soil temperatures during excessively or Johnson-grass fields in most northern areas hot periods. of the Southwest. It is emphasized that soil conditioners do not add any plant food to the soil. So far Sudan grass can be planted in all areas as is presently known, the chemicals included just as soon as the danger of frost is passed in the conditioners have no beneficial effect and will make quick, highly palatable, and upon plant growth itself. Their benefit comes nutritious pasture. solely from their effect on the physical char acteristics of the soil. A more desirable physi cal condition of the soil may enable plants to More About Bluetongue in Sheep make more effective use of plant nutrients already present or added by means of chemi Eradication of common gnats may be the cal fertilizers. answer to the successful control of bluetongue — a virus disease attacking sheep in Texas. Delay Spring Grazing Scientists in South Africa have identified It will be a strong temptation this spring night-flying as carriers of the virus in to put livestock on pastures just as soon as their country.midges Scientists at the Texas Agricul grasses begin to show a little green. tural Experiment Station near Sonora, Texas, that these same insects are transmit Ted Trew, extension pasture specialist for believe ting the from animal to animal and Texas A. 8s M. College, suggests that farmers from areadisease to area in Texas. and ranchers go slow with their spring graz ing program on Bermuda and dallis grass pas Bluetongue is now believed to have existed tures. Mr. Trew points out that these grasses unrecognized for at least two de went into the winter in a weakened condition cades. It was infirstTexas reported “soremuzzle” in much of the Southwest as a result of in 1952 and was widespread inas1953, drought and overgrazing and will be slow to time it was identified positively asat which blue start this spring. Moreover, if they are not tongue. given a rest period of 4 to 6 weeks after new growth begins, the stands will be weakened indicates that there is evidence substantially and production later in the sea of Research at least three strains of the disease in son will be reduced. Texas. Therefore, each strain must be iso Several suggestions are made for providing lated and a vaccine prepared to control that additional grazing while perennial grasses are specific strain. Even though natural infec being given a rest. Small grains and winter tion or vaccination produces lifelong immun legumes that were planted last fall will fur ity to one particular strain, they will not nish some grazing during the spring months necessarily give immunity to any other strain. without reducing grain yields. Dr. D. A. Price, veterinarian at the Sonora Also, small grains and legumes may be station, says that one of the Texas strains has planted now for spring grazing. It is rather been isolated, and tests are being conducted AGRICULTURAL NEWS LETTER to perfect a vaccine similar to the one used very successfully in the control of bluetongue in South Africa. 3 Poor Seed Is Expensive Seed Certified seed costs more, but the added ex pense purity, higher germination, and At the request of the Bureau of Animal better assures yields, according to L. C. Coffey, Ex Industry, the Bureau of Entomology and tension agronomist of Texas A. & M. College. Plant Quarantine has undertaken to classify the carrier gnats in the Southwest. The sur Certified seed is the best seed available of vey is being directed from Washington, with a particular variety. It comes from fields that a biological study being conducted from a have been inspected during the growing sea laboratory at Kerrville, Texas. son to insure purity. It has been handled properly after harvest, cleaned, and tested for purity and germination. In Texas, each sack Plan Now for Mechanical of certified seed carries a blue tag issued by Harvesting the State Department of Agriculture. Savings of $15 to $20 per bale of cotton The supply of certified seed usually is in through the use of harvesting machines have sufficient to meet the needs of all farmers. encouraged more and more growers to use Hence, it is advisable to purchase the seed mechanical pickers and strippers, according several weeks in advance of the planting to Fred C. Elliott, Extension cotton work spe season. cialist of Texas A. & M. College. Mr. Elliott estimates that nearly one-third of last year’s Texas cotton was mechanically harvested. Three yellow corn hybrids— Texas 26, 28, Much of the success in the use of mechani and 30—gave outstanding results in tests con cal harvesters depends on a coordinated pro ducted in 1953 at widely scattered locations gram of cotton production, beginning with over the State of Texas. Secure 1954 planting the laying out of the rows and the selection seed early. of the variety to plant. Improperly spaced rows and use of varieties not adapted to mechanical harvesting can make it impossible to use such harvesters efficiently. Farm Records— A Big Help Mr. Elliott makes the following recommen dations for planting cotton to be harvested A more complete record of their farming mechanically. operations in 1953 would have been a big help to many farmers in figuring income tax re 1. Plant storm-resistant varieties in 40- turns, states C, H. Bates, Extension farm man inch rows. agement specialist with the Texas A. & M. 2. Plant to obtain a stand of from two to College. six plants per foot of row. Written farm records are essential for com puting income tax returns, says Mr. Bates, 3. Space plants evenly in the rows; do not and they also can be the basis for improving hill drop. farm practices and cropping systems. A record 4. During late cultivations, set the cultiva of the year’s operations can be extremely tor sweeps so that the space between the helpful in evaluating the weak spots and rows will be lower than the ridges of dirt at strong points of the farm business, and now the base of the plants. is the time to start keeping a record for 1954. 4 AGRICULTURAL NEWS LETTER A number of farm record books that make record keeping easier are available from county agricultural agents, implement dealers, and others. The important thing is keeping some kind of written record. It should include an inventory of land, farm improvements, machinery, equipment, livestock, crops, and feed on hand; farm sales and expenses; farm products used in the home; and a summary of the year’s farming business. weevils in 1954. As in every year, this insect is a threat to cotton production, and with the reduced acreage in 1954 it will be even more important that farmers follow recommended practices in the control of weevils and other cotton insects. Guides for the control of cotton insects in 1954 will be available in the next few weeks from most agricultural experiment stations. Publications In early tests, two new tomato varieties, Texas Agricultural Experiment Station, Col Homestead and STEP 193, showed much lege Station: promise for central Texas plantings. Methods and Costs of Handling Texas Citrus, 1946-51, Bulletin 771, by H. B. Sorensen and C. K. Baker. Record Number of Boll Weevils M ethods of Supplying Phosphorus to Range Cattle in South Texas, Bulletin 773, by E. B. Reynolds and others. Indications that an all-time record number of boll weevils may have gone into hiberna American-Egyptian Cotton Variety Tests, tion last fall have been found by the Cotton El Paso Valley Experiment Station, Insect Laboratory of the United States De 1951-52, Progress Report 1609, by Lee partment of Agriculture at Tallulah, Louisi S. Stith and others. ana. Cotton Variety Tests in the Lower Rio Grande Valley, 1953, Progress Report M. T. Young, acting director of the labora 1618, by J, L. Hubbard and others. tory, says that an examination of ground trash in the fall of 1953 at various points in Yield and Chemical Composition of Crops northeast Louisiana showed an average of Grown for Forage at Mt. Pleasant, 19505,239 boll weevils per acre in hibernation. 52, Progress Report 1626, by Mark This is four times as many weevils as were Buckingham and others. found in the fall of 1952. The previous high Apple Varieties in Northeast Texas, Prog count was in the fall of 1950. ress Report 1627, by H. F. Morris. Commenting on this report, Kirby L. CockAn Economic Analysis of Land Clearing erham, entomologist for the Louisiana State and Subsequent Crop Production in the University Agricultural Extension Service, Corpus Christi Area, Progress Report points out that a large number of weevils in 1628, by Ralph H. Rogers and Joe R. hibernation does not necessarily mean extra Campbell. heavy boll weevil infestation next spring, as many of the weevils may not survive the win Copies of these bulletins may be obtained ter. However, it is a warning of possible dan by request to the publishers. ger, as a mild winter could result in the sur vival of a record number of weevils. Cotton farmers will do well to be prepared to take adequate measures to control boll The Agricultural News Letter is prepared in the Research Department under the direction of Carl H. M oore, Agricultural Economist.