000			03808nam a2200325 a 4500
003			OSt
005			20240218114913.0
008			070502s19uu xx 00 eng d
040			_cCvSU Main Campus Library
041	0		_aeng
082	0	4	_a635.21 _bAl4 1980
100		0	_aAlipit, Percival B. _eauthor _942593
245	1	0	_aPerformance of white potato (Solanum tuberosum L.) under varying soil moisture regimes and nitrogen-potassium levels / _cby Percival B. Alipit
260	0		_aLos Baños, Laguna : _c1980. _bCavite State University- Main Campus,
300			_a161 pages : _billustrations ; _c28 cm.
336			_2rdacontent _atext
337			_2rdamedia _aunmediated
338			_2rdacarrier _avolume
500			_aThesis (D.P.--Horticulture) University of the Philippines
504			_aIncludes bibliographical references.
520	3		_aPERCIVAL B. ALIPIT. March, 1980. University of the Philippines at Los Banos. Performance of White Potato (Solanum tuberosum Le) Under Varying Soil Moisture Regimes and Nitrogen-Potassium Levels. Major Professors Dafrosa A, del Rosario. A study was conducted for two cropping seasons to determine the influence of soil moisture and nitrogen--potassium fertilizer on yield and quality and other horticultural characteristics of white potato *Cosima’ in ta Trinidad, Benructe Irrigation during the carly dry season from mid-November to early February after 25 to 75% of the available soil moisture had been depleted did not influence total yield, tuber sines, and composition the late dry season from March to May, higher total yield and larger sized tubers were obtained With irrigation at 25% available soil moisture depletion. High yields from more frequently irrigated plants could be due to the high net assimilation rate, water-use efficiency, and relative water content observed. In both cropping seasons, however, the weight of marketable tubers produced by plants irrigated at 25 and 50% available soil moisture depletion was comparable. Moisture stress (75% depletion of the available soil moisture prior to irrigation) resulted in a high incidence of growth cracks and lobby Second growth in both seasons. Hollow heart observed only in the carly dry season was not affected by the soil moisture treatments. Potato plants grown in a soil containing 0.14% N, 10.40 ppm NO.=N and 0.23 me K and fertilized with 60-240 kg N-K/ha produced comparatively high total and marketable yield as & consequence of high leaf area index and relative water content. Fertilization with 120--300n kg N-~K/ha increased the marketable yield especially of the larger sized tubers. High N and low K levels (180-180 kg N+K/na) inercascad NO.=N uptake resulting in more tubers with second growth and hollow heart, High N and K (180-300 kz N~K/ha) promoted havulm growth and produced tubers with low dry matter and high sugar content. Application of 60-0 kz N~K/ha to plants in a soil With 0.14% N, 7236 ppm NO.-N and 0.65 mc K resulted in Comparatively good haulm development, high marketable yield of larger sized tubers, and high tuber specific gravity. Increasing the rate to 120“120 ke N-K/ia resulted in high crop growth and nct assimilation rates and relative water content accounting for the highest total a and marketable yield obtained.
541			_cSubmitted to the University Library _d05/04/2007 _eT-1134
650		0	_aPotatoes _917490
650		0	_aSoils _93106
650		0	_aFertilizers and manures _99069
690			_aDoctor of Philosophy in Horticulture _942675
700			_aDafrosa A, del Rosario _942594 _eadviser
856			_p80 _yClick here to view thesis abstract and table of contents _uhttp://library.cvsu.edu.ph/cgi-bin/koha/opac-retrieve-file.pl?id=583089a9ff0ab716bebdc4882b277bdd
942			_2ddc _cMAN
999			_c4994 _d4994